diff --git a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
index 42a301856..06b91002b 100644
--- a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
+++ b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
@@ -303,7 +303,9 @@ void unified_bed_leveling::G29() {
 
   const int8_t p_val = parser.intval('P', -1);
   const bool may_move = p_val == 1 || p_val == 2 || p_val == 4 || parser.seen('J');
-  TERN_(HAS_MULTI_HOTEND, const uint8_t old_tool_index = active_extruder);
+  #if ENABLED(HAS_MULTI_HOTEND)
+    const uint8_t old_tool_index = active_extruder;
+  #endif
 
   // Check for commands that require the printer to be homed
   if (may_move) {
diff --git a/Marlin/src/feature/caselight.h b/Marlin/src/feature/caselight.h
index 25bcb486f..05385ad0c 100644
--- a/Marlin/src/feature/caselight.h
+++ b/Marlin/src/feature/caselight.h
@@ -34,7 +34,9 @@
 class CaseLight {
 public:
   static bool on;
-  TERN_(CASELIGHT_USES_BRIGHTNESS, static uint8_t brightness);
+  #if ENABLED(CASELIGHT_USES_BRIGHTNESS)
+    static uint8_t brightness;
+  #endif
 
   static bool pin_is_pwm() { return TERN0(NEED_CASE_LIGHT_PIN, PWM_PIN(CASE_LIGHT_PIN)); }
   static bool has_brightness() { return TERN0(CASELIGHT_USES_BRIGHTNESS, TERN(CASE_LIGHT_USE_NEOPIXEL, true, pin_is_pwm())); }
@@ -50,8 +52,10 @@ public:
   static inline void update_brightness() { update(false); }
   static inline void update_enabled()    { update(true);  }
 
-private:
-  TERN_(CASE_LIGHT_IS_COLOR_LED, static LEDColor color);
+  #if ENABLED(CASE_LIGHT_IS_COLOR_LED)
+    private:
+      static LEDColor color;
+  #endif
 };
 
 extern CaseLight caselight;
diff --git a/Marlin/src/feature/joystick.h b/Marlin/src/feature/joystick.h
index e8e218b2f..d1c4fbd31 100644
--- a/Marlin/src/feature/joystick.h
+++ b/Marlin/src/feature/joystick.h
@@ -32,11 +32,19 @@
 class Joystick {
   friend class Temperature;
   private:
-    TERN_(HAS_JOY_ADC_X, static temp_info_t x);
-    TERN_(HAS_JOY_ADC_Y, static temp_info_t y);
-    TERN_(HAS_JOY_ADC_Z, static temp_info_t z);
+    #if ENABLED(HAS_JOY_ADC_X)
+      static temp_info_t x;
+    #endif
+    #if ENABLED(HAS_JOY_ADC_Y)
+      static temp_info_t y;
+    #endif
+    #if ENABLED(HAS_JOY_ADC_Z)
+      static temp_info_t z;
+    #endif
   public:
-    TERN_(JOYSTICK_DEBUG, static void report());
+    #if ENABLED(JOYSTICK_DEBUG)
+      static void report();
+    #endif
     static void calculate(xyz_float_t &norm_jog);
     static void inject_jog_moves();
 };
diff --git a/Marlin/src/feature/meatpack.cpp b/Marlin/src/feature/meatpack.cpp
index 44567ac48..0742f8235 100644
--- a/Marlin/src/feature/meatpack.cpp
+++ b/Marlin/src/feature/meatpack.cpp
@@ -57,7 +57,9 @@ uint8_t meatPackLookupTable[16] = {
   '\0' // Unused. 0b1111 indicates a literal character
 };
 
-TERN_(MP_DEBUG, uint8_t chars_decoded = 0); // Log the first 64 bytes after each reset
+#if ENABLED(MP_DEBUG)
+  uint8_t chars_decoded = 0;  // Log the first 64 bytes after each reset
+#endif
 
 void MeatPack::reset_state() {
   state = 0;
diff --git a/Marlin/src/feature/mixing.h b/Marlin/src/feature/mixing.h
index 65d1f1bf9..5de039985 100644
--- a/Marlin/src/feature/mixing.h
+++ b/Marlin/src/feature/mixing.h
@@ -61,9 +61,6 @@ enum MixTool {
 #define MAX_VTOOLS TERN(HAS_MIXER_SYNC_CHANNEL, 254, 255)
 static_assert(NR_MIXING_VIRTUAL_TOOLS <= MAX_VTOOLS, "MIXING_VIRTUAL_TOOLS must be <= " STRINGIFY(MAX_VTOOLS) "!");
 
-#define MIXER_BLOCK_FIELD       mixer_comp_t b_color[MIXING_STEPPERS]
-#define MIXER_POPULATE_BLOCK()  mixer.populate_block(block->b_color)
-#define MIXER_STEPPER_SETUP()   mixer.stepper_setup(current_block->b_color)
 #define MIXER_STEPPER_LOOP(VAR) for (uint_fast8_t VAR = 0; VAR < MIXING_STEPPERS; VAR++)
 
 #if ENABLED(GRADIENT_MIX)
@@ -73,9 +70,11 @@ static_assert(NR_MIXING_VIRTUAL_TOOLS <= MAX_VTOOLS, "MIXING_VIRTUAL_TOOLS must
     mixer_comp_t color[MIXING_STEPPERS];  // The current gradient color
     float start_z, end_z;                 // Region for gradient
     int8_t start_vtool, end_vtool;        // Start and end virtual tools
-    mixer_perc_t start_mix[MIXING_STEPPERS],   // Start and end mixes from those tools
+    mixer_perc_t start_mix[MIXING_STEPPERS],  // Start and end mixes from those tools
                  end_mix[MIXING_STEPPERS];
-    TERN_(GRADIENT_VTOOL, int8_t vtool_index); // Use this virtual tool number as index
+    #if ENABLED(GRADIENT_VTOOL)
+      int8_t vtool_index;                 // Use this virtual tool number as index
+    #endif
   } gradient_t;
 
 #endif
diff --git a/Marlin/src/feature/powerloss.h b/Marlin/src/feature/powerloss.h
index 12d11b141..7c09c0f3c 100644
--- a/Marlin/src/feature/powerloss.h
+++ b/Marlin/src/feature/powerloss.h
@@ -55,22 +55,38 @@ typedef struct {
   float zraise;
 
   // Repeat information
-  TERN_(GCODE_REPEAT_MARKERS, Repeat stored_repeat);
+  #if ENABLED(GCODE_REPEAT_MARKERS)
+    Repeat stored_repeat;
+  #endif
 
-  TERN_(HAS_HOME_OFFSET,    xyz_pos_t home_offset);
-  TERN_(HAS_POSITION_SHIFT, xyz_pos_t position_shift);
-  TERN_(HAS_MULTI_EXTRUDER, uint8_t active_extruder);
+  #if ENABLED(HAS_HOME_OFFSET)
+    xyz_pos_t home_offset;
+  #endif
+  #if ENABLED(HAS_POSITION_SHIFT)
+    xyz_pos_t position_shift;
+  #endif
+  #if ENABLED(HAS_MULTI_EXTRUDER)
+    uint8_t active_extruder;
+  #endif
 
   #if DISABLED(NO_VOLUMETRICS)
     bool volumetric_enabled;
     float filament_size[EXTRUDERS];
   #endif
 
-  TERN_(HAS_HOTEND,     celsius_t target_temperature[HOTENDS]);
-  TERN_(HAS_HEATED_BED, celsius_t target_temperature_bed);
-  TERN_(HAS_FAN,        uint8_t fan_speed[FAN_COUNT]);
+  #if ENABLED(HAS_HOTEND)
+    celsius_t target_temperature[HOTENDS];
+  #endif
+  #if ENABLED(HAS_HEATED_BED)
+    celsius_t target_temperature_bed;
+  #endif
+  #if ENABLED(HAS_FAN)
+    uint8_t fan_speed[FAN_COUNT];
+  #endif
 
-  TERN_(HAS_LEVELING, float fade);
+  #if ENABLED(HAS_LEVELING)
+    float fade;
+  #endif
 
   #if ENABLED(FWRETRACT)
     float retract[EXTRUDERS], retract_hop;
@@ -80,7 +96,9 @@ typedef struct {
   #if ENABLED(MIXING_EXTRUDER)
     //uint_fast8_t selected_vtool;
     //mixer_comp_t color[NR_MIXING_VIRTUAL_TOOLS][MIXING_STEPPERS];
-    TERN_(GRADIENT_MIX, gradient_t gradient);
+    #if ENABLED(GRADIENT_MIX)
+      gradient_t gradient;
+    #endif
   #endif
 
   // SD Filename and position
@@ -97,7 +115,9 @@ typedef struct {
   struct {
     bool dryrun:1;                // M111 S8
     bool allow_cold_extrusion:1;  // M302 P1
-    TERN_(HAS_LEVELING, bool leveling:1);
+    #if ENABLED(HAS_LEVELING)
+      bool leveling:1;
+    #endif
   } flag;
 
   uint8_t valid_foot;
diff --git a/Marlin/src/feature/tmc_util.h b/Marlin/src/feature/tmc_util.h
index b21b89f68..1767313ba 100644
--- a/Marlin/src/feature/tmc_util.h
+++ b/Marlin/src/feature/tmc_util.h
@@ -70,9 +70,15 @@ class TMCStorage {
     }
 
     struct {
-      TERN_(HAS_STEALTHCHOP, bool stealthChop_enabled = false);
-      TERN_(HYBRID_THRESHOLD, uint8_t hybrid_thrs = 0);
-      TERN_(USE_SENSORLESS, int16_t homing_thrs = 0);
+      #if ENABLED(HAS_STEALTHCHOP)
+        bool stealthChop_enabled = false;
+      #endif
+      #if ENABLED(HYBRID_THRESHOLD)
+        uint8_t hybrid_thrs = 0;
+      #endif
+      #if ENABLED(USE_SENSORLESS)
+        int16_t homing_thrs = 0;
+      #endif
     } stored;
 };
 
@@ -363,7 +369,9 @@ void test_tmc_connection(const bool test_x, const bool test_y, const bool test_z
 
     struct slow_homing_t {
       xy_ulong_t acceleration;
-      TERN_(HAS_CLASSIC_JERK, xy_float_t jerk_xy);
+      #if ENABLED(HAS_CLASSIC_JERK)
+        xy_float_t jerk_xy;
+      #endif
     };
   #endif
 
diff --git a/Marlin/src/gcode/bedlevel/G35.cpp b/Marlin/src/gcode/bedlevel/G35.cpp
index 88f02e6de..0fab74761 100644
--- a/Marlin/src/gcode/bedlevel/G35.cpp
+++ b/Marlin/src/gcode/bedlevel/G35.cpp
@@ -72,7 +72,9 @@ void GcodeSuite::G35() {
 
   // Disable the leveling matrix before auto-aligning
   #if HAS_LEVELING
-    TERN_(RESTORE_LEVELING_AFTER_G35, const bool leveling_was_active = planner.leveling_active);
+    #if ENABLED(RESTORE_LEVELING_AFTER_G35)
+      const bool leveling_was_active = planner.leveling_active;
+    #endif
     set_bed_leveling_enabled(false);
   #endif
 
diff --git a/Marlin/src/gcode/calibrate/G33.cpp b/Marlin/src/gcode/calibrate/G33.cpp
index 5530bc708..902711397 100644
--- a/Marlin/src/gcode/calibrate/G33.cpp
+++ b/Marlin/src/gcode/calibrate/G33.cpp
@@ -63,7 +63,9 @@ enum CalEnum : char {                        // the 7 main calibration points -
 #define LOOP_CAL_RAD(VAR) LOOP_CAL_PT(VAR, __A, _7P_STEP)
 #define LOOP_CAL_ACT(VAR, _4P, _OP) LOOP_CAL_PT(VAR, _OP ? _AB : __A, _4P ? _4P_STEP : _7P_STEP)
 
-TERN_(HAS_MULTI_HOTEND, const uint8_t old_tool_index = active_extruder);
+#if ENABLED(HAS_MULTI_HOTEND)
+  const uint8_t old_tool_index = active_extruder;
+#endif
 
 float lcd_probe_pt(const xy_pos_t &xy);
 
diff --git a/Marlin/src/gcode/calibrate/G34_M422.cpp b/Marlin/src/gcode/calibrate/G34_M422.cpp
index bee6aaede..d2075fedc 100644
--- a/Marlin/src/gcode/calibrate/G34_M422.cpp
+++ b/Marlin/src/gcode/calibrate/G34_M422.cpp
@@ -130,7 +130,9 @@ void GcodeSuite::G34() {
 
       // Disable the leveling matrix before auto-aligning
       #if HAS_LEVELING
-        TERN_(RESTORE_LEVELING_AFTER_G34, const bool leveling_was_active = planner.leveling_active);
+        #if ENABLED(RESTORE_LEVELING_AFTER_G34)
+          const bool leveling_was_active = planner.leveling_active;
+        #endif
         set_bed_leveling_enabled(false);
       #endif
 
diff --git a/Marlin/src/gcode/gcode.h b/Marlin/src/gcode/gcode.h
index 52570ff83..7ea248958 100644
--- a/Marlin/src/gcode/gcode.h
+++ b/Marlin/src/gcode/gcode.h
@@ -418,24 +418,34 @@ public:
 
 private:
 
-  TERN_(MARLIN_DEV_MODE, static void D(const int16_t dcode));
+  #if ENABLED(MARLIN_DEV_MODE)
+    static void D(const int16_t dcode);
+  #endif
 
   static void G0_G1(TERN_(HAS_FAST_MOVES, const bool fast_move=false));
 
-  TERN_(ARC_SUPPORT, static void G2_G3(const bool clockwise));
+  #if ENABLED(ARC_SUPPORT)
+    static void G2_G3(const bool clockwise);
+  #endif
 
   static void G4();
 
-  TERN_(BEZIER_CURVE_SUPPORT, static void G5());
+  #if ENABLED(BEZIER_CURVE_SUPPORT)
+    static void G5();
+  #endif
 
-  TERN_(DIRECT_STEPPING, static void G6());
+  #if ENABLED(DIRECT_STEPPING)
+    static void G6();
+  #endif
 
   #if ENABLED(FWRETRACT)
     static void G10();
     static void G11();
   #endif
 
-  TERN_(NOZZLE_CLEAN_FEATURE, static void G12());
+  #if ENABLED(NOZZLE_CLEAN_FEATURE)
+    static void G12();
+  #endif
 
   #if ENABLED(CNC_WORKSPACE_PLANES)
     static void G17();
@@ -448,9 +458,13 @@ private:
     static void G21();
   #endif
 
-  TERN_(G26_MESH_VALIDATION, static void G26());
+  #if ENABLED(G26_MESH_VALIDATION)
+    static void G26();
+  #endif
 
-  TERN_(NOZZLE_PARK_FEATURE, static void G27());
+  #if ENABLED(NOZZLE_PARK_FEATURE)
+    static void G27();
+  #endif
 
   static void G28();
 
@@ -474,19 +488,29 @@ private:
     #endif
   #endif
 
-  TERN_(DELTA_AUTO_CALIBRATION, static void G33());
+  #if ENABLED(DELTA_AUTO_CALIBRATION)
+    static void G33();
+  #endif
 
   #if ANY(Z_MULTI_ENDSTOPS, Z_STEPPER_AUTO_ALIGN, MECHANICAL_GANTRY_CALIBRATION)
     static void G34();
   #endif
 
-  TERN_(Z_STEPPER_AUTO_ALIGN, static void M422());
+  #if ENABLED(Z_STEPPER_AUTO_ALIGN)
+    static void M422();
+  #endif
 
-  TERN_(ASSISTED_TRAMMING, static void G35());
+  #if ENABLED(ASSISTED_TRAMMING)
+    static void G35();
+  #endif
 
-  TERN_(G38_PROBE_TARGET, static void G38(const int8_t subcode));
+  #if ENABLED(G38_PROBE_TARGET)
+    static void G38(const int8_t subcode);
+  #endif
 
-  TERN_(HAS_MESH, static void G42());
+  #if ENABLED(HAS_MESH)
+    static void G42();
+  #endif
 
   #if ENABLED(CNC_COORDINATE_SYSTEMS)
     static void G53();
@@ -498,20 +522,28 @@ private:
     static void G59();
   #endif
 
-  TERN_(PROBE_TEMP_COMPENSATION, static void G76());
+  #if ENABLED(PROBE_TEMP_COMPENSATION)
+    static void G76();
+  #endif
 
   #if SAVED_POSITIONS
     static void G60();
     static void G61();
   #endif
 
-  TERN_(GCODE_MOTION_MODES, static void G80());
+  #if ENABLED(GCODE_MOTION_MODES)
+    static void G80();
+  #endif
 
   static void G92();
 
-  TERN_(CALIBRATION_GCODE, static void G425());
+  #if ENABLED(CALIBRATION_GCODE)
+    static void G425();
+  #endif
 
-  TERN_(HAS_RESUME_CONTINUE, static void M0_M1());
+  #if ENABLED(HAS_RESUME_CONTINUE)
+    static void M0_M1();
+  #endif
 
   #if HAS_CUTTER
     static void M3_M4(const bool is_M4);
@@ -519,14 +551,22 @@ private:
   #endif
 
   #if ENABLED(COOLANT_CONTROL)
-    TERN_(COOLANT_MIST, static void M7());
-    TERN_(COOLANT_FLOOD, static void M8());
+    #if ENABLED(COOLANT_MIST)
+      static void M7();
+    #endif
+    #if ENABLED(COOLANT_FLOOD)
+      static void M8();
+    #endif
     static void M9();
   #endif
 
-  TERN_(EXTERNAL_CLOSED_LOOP_CONTROLLER, static void M12());
+  #if ENABLED(EXTERNAL_CLOSED_LOOP_CONTROLLER)
+    static void M12();
+  #endif
 
-  TERN_(EXPECTED_PRINTER_CHECK, static void M16());
+  #if ENABLED(EXPECTED_PRINTER_CHECK)
+    static void M16();
+  #endif
 
   static void M17();
 
@@ -549,27 +589,43 @@ private:
   static void M31();
 
   #if ENABLED(SDSUPPORT)
-    TERN_(HAS_MEDIA_SUBCALLS, static void M32());
-    TERN_(LONG_FILENAME_HOST_SUPPORT, static void M33());
+    #if ENABLED(HAS_MEDIA_SUBCALLS)
+      static void M32();
+    #endif
+    #if ENABLED(LONG_FILENAME_HOST_SUPPORT)
+      static void M33();
+    #endif
     #if BOTH(SDCARD_SORT_ALPHA, SDSORT_GCODE)
       static void M34();
     #endif
   #endif
 
-  TERN_(DIRECT_PIN_CONTROL, static void M42());
-  TERN_(PINS_DEBUGGING, static void M43());
+  #if ENABLED(DIRECT_PIN_CONTROL)
+    static void M42();
+  #endif
+  #if ENABLED(PINS_DEBUGGING)
+    static void M43();
+  #endif
 
-  TERN_(Z_MIN_PROBE_REPEATABILITY_TEST, static void M48());
+  #if ENABLED(Z_MIN_PROBE_REPEATABILITY_TEST)
+    static void M48();
+  #endif
 
-  TERN_(LCD_SET_PROGRESS_MANUALLY, static void M73());
+  #if ENABLED(LCD_SET_PROGRESS_MANUALLY)
+    static void M73();
+  #endif
 
   static void M75();
   static void M76();
   static void M77();
 
-  TERN_(PRINTCOUNTER, static void M78());
+  #if ENABLED(PRINTCOUNTER)
+    static void M78();
+  #endif
 
-  TERN_(PSU_CONTROL, static void M80());
+  #if ENABLED(PSU_CONTROL)
+    static void M80();
+  #endif
 
   static void M81();
   static void M82();
@@ -577,7 +633,9 @@ private:
   static void M85();
   static void M92();
 
-  TERN_(M100_FREE_MEMORY_WATCHER, static void M100());
+  #if ENABLED(M100_FREE_MEMORY_WATCHER)
+    static void M100();
+  #endif
 
   #if EXTRUDERS
     static void M104();
@@ -595,13 +653,17 @@ private:
     static void M108();
     static void M112();
     static void M410();
-    TERN_(HOST_PROMPT_SUPPORT, static void M876());
+    #if ENABLED(HOST_PROMPT_SUPPORT)
+      static void M876();
+    #endif
   #endif
 
   static void M110();
   static void M111();
 
-  TERN_(HOST_KEEPALIVE_FEATURE, static void M113());
+  #if ENABLED(HOST_KEEPALIVE_FEATURE)
+    static void M113();
+  #endif
 
   static void M114();
   static void M115();
@@ -611,7 +673,9 @@ private:
   static void M120();
   static void M121();
 
-  TERN_(PARK_HEAD_ON_PAUSE, static void M125());
+  #if ENABLED(PARK_HEAD_ON_PAUSE)
+    static void M125();
+  #endif
 
   #if ENABLED(BARICUDA)
     #if HAS_HEATER_1
@@ -643,9 +707,13 @@ private:
     static void M145();
   #endif
 
-  TERN_(TEMPERATURE_UNITS_SUPPORT, static void M149());
+  #if ENABLED(TEMPERATURE_UNITS_SUPPORT)
+    static void M149();
+  #endif
 
-  TERN_(HAS_COLOR_LEDS, static void M150());
+  #if ENABLED(HAS_COLOR_LEDS)
+    static void M150();
+  #endif
 
   #if BOTH(AUTO_REPORT_TEMPERATURES, HAS_TEMP_SENSOR)
     static void M155();
@@ -654,8 +722,12 @@ private:
   #if ENABLED(MIXING_EXTRUDER)
     static void M163();
     static void M164();
-    TERN_(DIRECT_MIXING_IN_G1, static void M165());
-    TERN_(GRADIENT_MIX, static void M166());
+    #if ENABLED(DIRECT_MIXING_IN_G1)
+      static void M165();
+    #endif
+    #if ENABLED(GRADIENT_MIX)
+      static void M166();
+    #endif
   #endif
 
   static void M200();
@@ -669,19 +741,27 @@ private:
   static void M204();
   static void M205();
 
-  TERN_(HAS_M206_COMMAND, static void M206());
+  #if ENABLED(HAS_M206_COMMAND)
+    static void M206();
+  #endif
 
   #if ENABLED(FWRETRACT)
     static void M207();
     static void M208();
-    TERN_(FWRETRACT_AUTORETRACT, static void M209());
+    #if ENABLED(FWRETRACT_AUTORETRACT)
+      static void M209();
+    #endif
   #endif
 
   static void M211();
 
-  TERN_(HAS_MULTI_EXTRUDER, static void M217());
+  #if ENABLED(HAS_MULTI_EXTRUDER)
+    static void M217();
+  #endif
 
-  TERN_(HAS_HOTEND_OFFSET, static void M218());
+  #if ENABLED(HAS_HOTEND_OFFSET)
+    static void M218();
+  #endif
 
   static void M220();
 
@@ -689,11 +769,17 @@ private:
     static void M221();
   #endif
 
-  TERN_(DIRECT_PIN_CONTROL, static void M226());
+  #if ENABLED(DIRECT_PIN_CONTROL)
+    static void M226();
+  #endif
 
-  TERN_(PHOTO_GCODE, static void M240());
+  #if ENABLED(PHOTO_GCODE)
+    static void M240();
+  #endif
 
-  TERN_(HAS_LCD_CONTRAST, static void M250());
+  #if ENABLED(HAS_LCD_CONTRAST)
+    static void M250();
+  #endif
 
   #if ENABLED(EXPERIMENTAL_I2CBUS)
     static void M260();
@@ -702,33 +788,55 @@ private:
 
   #if HAS_SERVOS
     static void M280();
-    TERN_(EDITABLE_SERVO_ANGLES, static void M281());
+    #if ENABLED(EDITABLE_SERVO_ANGLES)
+      static void M281();
+    #endif
   #endif
 
-  TERN_(BABYSTEPPING, static void M290());
+  #if ENABLED(BABYSTEPPING)
+    static void M290();
+  #endif
 
-  TERN_(HAS_BUZZER, static void M300());
+  #if ENABLED(HAS_BUZZER)
+    static void M300();
+  #endif
 
-  TERN_(PIDTEMP, static void M301());
+  #if ENABLED(PIDTEMP)
+    static void M301();
+  #endif
 
-  TERN_(PREVENT_COLD_EXTRUSION, static void M302());
+  #if ENABLED(PREVENT_COLD_EXTRUSION)
+    static void M302();
+  #endif
 
-  TERN_(HAS_PID_HEATING, static void M303());
+  #if ENABLED(HAS_PID_HEATING)
+    static void M303();
+  #endif
 
-  TERN_(PIDTEMPBED, static void M304());
+  #if ENABLED(PIDTEMPBED)
+    static void M304();
+  #endif
 
-  TERN_(HAS_USER_THERMISTORS, static void M305());
+  #if ENABLED(HAS_USER_THERMISTORS)
+    static void M305();
+  #endif
 
-  TERN_(PIDTEMPCHAMBER, static void M309());
+  #if ENABLED(PIDTEMPCHAMBER)
+    static void M309();
+  #endif
 
   #if HAS_MICROSTEPS
     static void M350();
     static void M351();
   #endif
 
-  TERN_(CASE_LIGHT_ENABLE, static void M355());
+  #if ENABLED(CASE_LIGHT_ENABLE)
+    static void M355();
+  #endif
 
-  TERN_(REPETIER_GCODE_M360, static void M360());
+  #if ENABLED(REPETIER_GCODE_M360)
+    static void M360();
+  #endif
 
   #if ENABLED(MORGAN_SCARA)
     static bool M360();
@@ -750,7 +858,9 @@ private:
     static void M402();
   #endif
 
-  TERN_(HAS_PRUSA_MMU2, static void M403());
+  #if ENABLED(HAS_PRUSA_MMU2)
+    static void M403();
+  #endif
 
   #if ENABLED(FILAMENT_WIDTH_SENSOR)
     static void M404();
@@ -759,22 +869,34 @@ private:
     static void M407();
   #endif
 
-  TERN_(HAS_FILAMENT_SENSOR, static void M412());
+  #if ENABLED(HAS_FILAMENT_SENSOR)
+    static void M412();
+  #endif
 
-  TERN_(HAS_MULTI_LANGUAGE, static void M414());
+  #if ENABLED(HAS_MULTI_LANGUAGE)
+    static void M414();
+  #endif
 
   #if HAS_LEVELING
     static void M420();
     static void M421();
   #endif
 
-  TERN_(BACKLASH_GCODE, static void M425());
+  #if ENABLED(BACKLASH_GCODE)
+    static void M425();
+  #endif
 
-  TERN_(HAS_M206_COMMAND, static void M428());
+  #if ENABLED(HAS_M206_COMMAND)
+    static void M428();
+  #endif
 
-  TERN_(HAS_POWER_MONITOR, static void M430());
+  #if ENABLED(HAS_POWER_MONITOR)
+    static void M430();
+  #endif
 
-  TERN_(CANCEL_OBJECTS, static void M486());
+  #if ENABLED(CANCEL_OBJECTS)
+    static void M486();
+  #endif
 
   static void M500();
   static void M501();
@@ -782,17 +904,27 @@ private:
   #if DISABLED(DISABLE_M503)
     static void M503();
   #endif
-  TERN_(EEPROM_SETTINGS, static void M504());
+  #if ENABLED(EEPROM_SETTINGS)
+    static void M504();
+  #endif
 
   #if ENABLED(PASSWORD_FEATURE)
     static void M510();
-    TERN_(PASSWORD_UNLOCK_GCODE, static void M511());
-    TERN_(PASSWORD_CHANGE_GCODE, static void M512());
+    #if ENABLED(PASSWORD_UNLOCK_GCODE)
+      static void M511();
+    #endif
+    #if ENABLED(PASSWORD_CHANGE_GCODE)
+      static void M512();
+    #endif
   #endif
 
-  TERN_(SDSUPPORT, static void M524());
+  #if ENABLED(SDSUPPORT)
+    static void M524();
+  #endif
 
-  TERN_(SD_ABORT_ON_ENDSTOP_HIT, static void M540());
+  #if ENABLED(SD_ABORT_ON_ENDSTOP_HIT)
+    static void M540();
+  #endif
 
   #if HAS_ETHERNET
     static void M552();
@@ -800,16 +932,22 @@ private:
     static void M554();
   #endif
 
-  TERN_(BAUD_RATE_GCODE, static void M575());
+  #if ENABLED(BAUD_RATE_GCODE)
+    static void M575();
+  #endif
 
   #if ENABLED(ADVANCED_PAUSE_FEATURE)
     static void M600();
     static void M603();
   #endif
 
-  TERN_(HAS_DUPLICATION_MODE, static void M605());
+  #if ENABLED(HAS_DUPLICATION_MODE)
+    static void M605();
+  #endif
 
-  TERN_(IS_KINEMATIC, static void M665());
+  #if ENABLED(IS_KINEMATIC)
+    static void M665();
+  #endif
 
   #if ENABLED(DELTA) || HAS_EXTRA_ENDSTOPS
     static void M666();
@@ -824,13 +962,21 @@ private:
     static void M702();
   #endif
 
-  TERN_(GCODE_REPEAT_MARKERS, static void M808());
+  #if ENABLED(GCODE_REPEAT_MARKERS)
+    static void M808();
+  #endif
 
-  TERN_(GCODE_MACROS, static void M810_819());
+  #if ENABLED(GCODE_MACROS)
+    static void M810_819();
+  #endif
 
-  TERN_(HAS_BED_PROBE, static void M851());
+  #if ENABLED(HAS_BED_PROBE)
+    static void M851();
+  #endif
 
-  TERN_(SKEW_CORRECTION_GCODE, static void M852());
+  #if ENABLED(SKEW_CORRECTION_GCODE)
+    static void M852();
+  #endif
 
   #if ENABLED(I2C_POSITION_ENCODERS)
     FORCE_INLINE static void M860() { I2CPEM.M860(); }
@@ -850,18 +996,26 @@ private:
     static void M871();
   #endif
 
-  TERN_(LIN_ADVANCE, static void M900());
+  #if ENABLED(LIN_ADVANCE)
+    static void M900();
+  #endif
 
   #if HAS_TRINAMIC_CONFIG
     static void M122();
     static void M906();
-    TERN_(HAS_STEALTHCHOP, static void M569());
+    #if ENABLED(HAS_STEALTHCHOP)
+      static void M569();
+    #endif
     #if ENABLED(MONITOR_DRIVER_STATUS)
       static void M911();
       static void M912();
     #endif
-    TERN_(HYBRID_THRESHOLD, static void M913());
-    TERN_(USE_SENSORLESS, static void M914());
+    #if ENABLED(HYBRID_THRESHOLD)
+      static void M913();
+    #endif
+    #if ENABLED(USE_SENSORLESS)
+      static void M914();
+    #endif
   #endif
 
   #if HAS_L64XX
@@ -883,18 +1037,26 @@ private:
     #endif
   #endif
 
-  TERN_(SDSUPPORT, static void M928());
+  #if ENABLED(SDSUPPORT)
+    static void M928();
+  #endif
 
-  TERN_(MAGNETIC_PARKING_EXTRUDER, static void M951());
+  #if ENABLED(MAGNETIC_PARKING_EXTRUDER)
+    static void M951();
+  #endif
 
-  TERN_(TOUCH_SCREEN_CALIBRATION, static void M995());
+  #if ENABLED(TOUCH_SCREEN_CALIBRATION)
+    static void M995();
+  #endif
 
   #if BOTH(HAS_SPI_FLASH, SDSUPPORT)
     static void M993();
     static void M994();
   #endif
 
-  TERN_(PLATFORM_M997_SUPPORT, static void M997());
+  #if ENABLED(PLATFORM_M997_SUPPORT)
+    static void M997();
+  #endif
 
   static void M999();
 
@@ -903,11 +1065,17 @@ private:
     static void M1000();
   #endif
 
-  TERN_(SDSUPPORT, static void M1001());
+  #if ENABLED(SDSUPPORT)
+    static void M1001();
+  #endif
 
-  TERN_(MAX7219_GCODE, static void M7219());
+  #if ENABLED(MAX7219_GCODE)
+    static void M7219();
+  #endif
 
-  TERN_(CONTROLLER_FAN_EDITABLE, static void M710());
+  #if ENABLED(CONTROLLER_FAN_EDITABLE)
+    static void M710();
+  #endif
 
   static void T(const int8_t tool_index);
 
diff --git a/Marlin/src/gcode/queue.h b/Marlin/src/gcode/queue.h
index 8e87d114e..4d3ccb364 100644
--- a/Marlin/src/gcode/queue.h
+++ b/Marlin/src/gcode/queue.h
@@ -40,9 +40,9 @@ public:
      * M110 N<int> sets the current line number.
      */
     long last_N;
-    int count;                        //!< Number of characters read in the current line of serial input
-    char line_buffer[MAX_CMD_SIZE];   //!< The current line accumulator
-    uint8_t input_state;              //!< The input state
+    int count;                      //!< Number of characters read in the current line of serial input
+    char line_buffer[MAX_CMD_SIZE]; //!< The current line accumulator
+    uint8_t input_state;            //!< The input state
   };
 
   static SerialState serial_state[NUM_SERIAL]; //!< Serial states for each serial port
@@ -57,9 +57,11 @@ public:
    * command and hands off execution to individual handler functions.
    */
   struct CommandLine {
-    char buffer[MAX_CMD_SIZE];                    //!< The command buffer
-    bool skip_ok;                                 //!< Skip sending ok when command is processed?
-    TERN_(HAS_MULTI_SERIAL, serial_index_t port); //!< Serial port the command was received on
+    char buffer[MAX_CMD_SIZE];      //!< The command buffer
+    bool skip_ok;                   //!< Skip sending ok when command is processed?
+    #if ENABLED(HAS_MULTI_SERIAL)
+      serial_index_t port;          //!< Serial port the command was received on
+    #endif
   };
 
   /**
diff --git a/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp
index dcb65f676..a2dfb74a5 100644
--- a/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp
+++ b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp
@@ -536,7 +536,9 @@ void ST7920_Lite_Status_Screen::draw_heat_icon(const bool whichIcon, const bool
 static struct {
   bool E1_show_target  : 1;
   bool E2_show_target  : 1;
-  TERN_(HAS_HEATED_BED, bool bed_show_target : 1);
+  #if ENABLED(HAS_HEATED_BED)
+    bool bed_show_target : 1;
+  #endif
 } display_state = {
   true, true, TERN_(HAS_HEATED_BED, true)
 };
diff --git a/Marlin/src/lcd/dwin/e3v2/dwin.cpp b/Marlin/src/lcd/dwin/e3v2/dwin.cpp
index 0e9b93525..d543ff050 100644
--- a/Marlin/src/lcd/dwin/e3v2/dwin.cpp
+++ b/Marlin/src/lcd/dwin/e3v2/dwin.cpp
@@ -180,8 +180,12 @@ static uint8_t _card_percent = 0;
 static uint16_t _remain_time = 0;
 
 #if ENABLED(PAUSE_HEAT)
-  TERN_(HAS_HOTEND, uint16_t resume_hotend_temp = 0);
-  TERN_(HAS_HEATED_BED, uint16_t resume_bed_temp = 0);
+  #if ENABLED(HAS_HOTEND)
+    uint16_t resume_hotend_temp = 0;
+  #endif
+  #if ENABLED(HAS_HEATED_BED)
+    uint16_t resume_bed_temp = 0;
+  #endif
 #endif
 
 #if HAS_ZOFFSET_ITEM
diff --git a/Marlin/src/lcd/dwin/e3v2/dwin.h b/Marlin/src/lcd/dwin/e3v2/dwin.h
index 9e0cda86c..dd2d1cbc0 100644
--- a/Marlin/src/lcd/dwin/e3v2/dwin.h
+++ b/Marlin/src/lcd/dwin/e3v2/dwin.h
@@ -234,9 +234,15 @@ extern char print_filename[16];
 extern millis_t dwin_heat_time;
 
 typedef struct {
-  TERN_(HAS_HOTEND,     celsius_t E_Temp    = 0);
-  TERN_(HAS_HEATED_BED, celsius_t Bed_Temp  = 0);
-  TERN_(HAS_FAN,        int16_t Fan_speed = 0);
+  #if ENABLED(HAS_HOTEND)
+    celsius_t E_Temp = 0;
+  #endif
+  #if ENABLED(HAS_HEATED_BED)
+    celsius_t Bed_Temp = 0;
+  #endif
+  #if ENABLED(HAS_FAN)
+    int16_t Fan_speed = 0;
+  #endif
   int16_t print_speed     = 100;
   float Max_Feedspeed     = 0;
   float Max_Acceleration  = 0;
@@ -312,9 +318,15 @@ void HMI_Move_E();
 
 void HMI_Zoffset();
 
-TERN_(HAS_HOTEND,     void HMI_ETemp());
-TERN_(HAS_HEATED_BED, void HMI_BedTemp());
-TERN_(HAS_FAN,        void HMI_FanSpeed());
+#if ENABLED(HAS_HOTEND)
+  void HMI_ETemp();
+#endif
+#if ENABLED(HAS_HEATED_BED)
+  void HMI_BedTemp();
+#endif
+#if ENABLED(HAS_FAN)
+  void HMI_FanSpeed();
+#endif
 
 void HMI_PrintSpeed();
 
diff --git a/Marlin/src/lcd/extui/lib/dgus/DGUSScreenHandler.cpp b/Marlin/src/lcd/extui/lib/dgus/DGUSScreenHandler.cpp
index 473fcb954..a585ef670 100644
--- a/Marlin/src/lcd/extui/lib/dgus/DGUSScreenHandler.cpp
+++ b/Marlin/src/lcd/extui/lib/dgus/DGUSScreenHandler.cpp
@@ -624,7 +624,9 @@ void DGUSScreenHandler::HandleHeaterControl(DGUS_VP_Variable &var, void *val_ptr
     DEBUG_ECHOLNPGM("HandlePreheat");
 
     uint8_t e_temp = 0;
-    TERN_(HAS_HEATED_BED, uint8_t bed_temp = 0);
+    #if ENABLED(HAS_HEATED_BED)
+      uint8_t bed_temp = 0;
+    #endif
     const uint16_t preheat_option = swap16(*(uint16_t*)val_ptr);
     switch (preheat_option) {
       default:
diff --git a/Marlin/src/lcd/extui/lib/mks_ui/draw_printing.cpp b/Marlin/src/lcd/extui/lib/mks_ui/draw_printing.cpp
index 2cc6d19cc..e9e501ae5 100644
--- a/Marlin/src/lcd/extui/lib/mks_ui/draw_printing.cpp
+++ b/Marlin/src/lcd/extui/lib/mks_ui/draw_printing.cpp
@@ -49,7 +49,9 @@ static lv_obj_t *labelPause, *labelStop, *labelOperat;
 static lv_obj_t *bar1, *bar1ValueText;
 static lv_obj_t *buttonPause, *buttonOperat, *buttonStop;
 
-TERN_(HAS_MULTI_EXTRUDER, static lv_obj_t *labelExt2);
+#if ENABLED(HAS_MULTI_EXTRUDER)
+  static lv_obj_t *labelExt2;
+#endif
 
 #if HAS_HEATED_BED
   static lv_obj_t* labelBed;
diff --git a/Marlin/src/lcd/extui/ui_api.cpp b/Marlin/src/lcd/extui/ui_api.cpp
index 9e5e0b6a6..cfd48e5dd 100644
--- a/Marlin/src/lcd/extui/ui_api.cpp
+++ b/Marlin/src/lcd/extui/ui_api.cpp
@@ -103,8 +103,12 @@
 namespace ExtUI {
   static struct {
     uint8_t printer_killed : 1;
-    TERN_(JOYSTICK, uint8_t jogging : 1);
-    TERN_(SDSUPPORT, uint8_t was_sd_printing : 1);
+    #if ENABLED(JOYSTICK)
+      uint8_t jogging : 1;
+    #endif
+    #if ENABLED(SDSUPPORT)
+      uint8_t was_sd_printing : 1;
+    #endif
   } flags;
 
   #ifdef __SAM3X8E__
@@ -175,8 +179,12 @@ namespace ExtUI {
         #if HAS_HEATED_BED
           case BED: thermalManager.reset_bed_idle_timer(); return;
         #endif
-        TERN_(HAS_HEATED_CHAMBER, case CHAMBER: return); // Chamber has no idle timer
-        TERN_(HAS_COOLER, case COOLER: return); // Cooler has no idle timer
+        #if ENABLED(HAS_HEATED_CHAMBER)
+          case CHAMBER: return; // Chamber has no idle timer
+        #endif
+        #if ENABLED(HAS_COOLER)
+          case COOLER: return;  // Cooler has no idle timer
+        #endif
         default:
           TERN_(HAS_HOTEND, thermalManager.reset_hotend_idle_timer(heater - H0));
           break;
@@ -234,8 +242,12 @@ namespace ExtUI {
   bool isHeaterIdle(const heater_t heater) {
     #if HEATER_IDLE_HANDLER
       switch (heater) {
-        TERN_(HAS_HEATED_BED, case BED: return thermalManager.heater_idle[thermalManager.IDLE_INDEX_BED].timed_out);
-        TERN_(HAS_HEATED_CHAMBER, case CHAMBER: return false); // Chamber has no idle timer
+        #if ENABLED(HAS_HEATED_BED)
+          case BED: return thermalManager.heater_idle[thermalManager.IDLE_INDEX_BED].timed_out;
+        #endif
+        #if ENABLED(HAS_HEATED_CHAMBER)
+          case CHAMBER: return false; // Chamber has no idle timer
+        #endif
         default:
           return TERN0(HAS_HOTEND, thermalManager.heater_idle[heater - H0].timed_out);
       }
@@ -253,8 +265,12 @@ namespace ExtUI {
 
   float getActualTemp_celsius(const heater_t heater) {
     switch (heater) {
-      TERN_(HAS_HEATED_BED, case BED: return GET_TEMP_ADJUSTMENT(thermalManager.degBed()));
-      TERN_(HAS_HEATED_CHAMBER, case CHAMBER: return GET_TEMP_ADJUSTMENT(thermalManager.degChamber()));
+      #if ENABLED(HAS_HEATED_BED)
+        case BED: return GET_TEMP_ADJUSTMENT(thermalManager.degBed());
+      #endif
+      #if ENABLED(HAS_HEATED_CHAMBER)
+        case CHAMBER: return GET_TEMP_ADJUSTMENT(thermalManager.degChamber());
+      #endif
       default: return GET_TEMP_ADJUSTMENT(thermalManager.degHotend(heater - H0));
     }
   }
@@ -265,8 +281,12 @@ namespace ExtUI {
 
   float getTargetTemp_celsius(const heater_t heater) {
     switch (heater) {
-      TERN_(HAS_HEATED_BED, case BED: return GET_TEMP_ADJUSTMENT(thermalManager.degTargetBed()));
-      TERN_(HAS_HEATED_CHAMBER, case CHAMBER: return GET_TEMP_ADJUSTMENT(thermalManager.degTargetChamber()));
+      #if ENABLED(HAS_HEATED_BED)
+        case BED: return GET_TEMP_ADJUSTMENT(thermalManager.degTargetBed());
+      #endif
+      #if ENABLED(HAS_HEATED_CHAMBER)
+        case CHAMBER: return GET_TEMP_ADJUSTMENT(thermalManager.degTargetChamber());
+      #endif
       default: return GET_TEMP_ADJUSTMENT(thermalManager.degTargetHotend(heater - H0));
     }
   }
@@ -294,13 +314,13 @@ namespace ExtUI {
   }
 
   float getAxisPosition_mm(const axis_t axis) {
-    return TERN_(JOYSTICK, flags.jogging ? destination[axis] :) current_position[axis];
+    return TERN0(JOYSTICK, flags.jogging) ? destination[axis] : current_position[axis];
   }
 
   float getAxisPosition_mm(const extruder_t extruder) {
     const extruder_t old_tool = getActiveTool();
     setActiveTool(extruder, true);
-    const float epos = TERN_(JOYSTICK, flags.jogging ? destination.e :) current_position.e;
+    const float epos = TERN0(JOYSTICK, flags.jogging) ? destination.e : current_position.e;
     setActiveTool(old_tool, true);
     return epos;
   }
@@ -491,14 +511,30 @@ namespace ExtUI {
 
     int getTMCBumpSensitivity(const axis_t axis) {
       switch (axis) {
-        TERN_(X_SENSORLESS,  case X:  return stepperX.homing_threshold());
-        TERN_(X2_SENSORLESS, case X2: return stepperX2.homing_threshold());
-        TERN_(Y_SENSORLESS,  case Y:  return stepperY.homing_threshold());
-        TERN_(Y2_SENSORLESS, case Y2: return stepperY2.homing_threshold());
-        TERN_(Z_SENSORLESS,  case Z:  return stepperZ.homing_threshold());
-        TERN_(Z2_SENSORLESS, case Z2: return stepperZ2.homing_threshold());
-        TERN_(Z3_SENSORLESS, case Z3: return stepperZ3.homing_threshold());
-        TERN_(Z4_SENSORLESS, case Z4: return stepperZ4.homing_threshold());
+        #if ENABLED(X_SENSORLESS)
+          case X:  return stepperX.homing_threshold();
+        #endif
+        #if ENABLED(X2_SENSORLESS)
+          case X2: return stepperX2.homing_threshold();
+        #endif
+        #if ENABLED(Y_SENSORLESS)
+          case Y:  return stepperY.homing_threshold();
+        #endif
+        #if ENABLED(Y2_SENSORLESS)
+          case Y2: return stepperY2.homing_threshold();
+        #endif
+        #if ENABLED(Z_SENSORLESS)
+          case Z:  return stepperZ.homing_threshold();
+        #endif
+        #if ENABLED(Z2_SENSORLESS)
+          case Z2: return stepperZ2.homing_threshold();
+        #endif
+        #if ENABLED(Z3_SENSORLESS)
+          case Z3: return stepperZ3.homing_threshold();
+        #endif
+        #if ENABLED(Z4_SENSORLESS)
+          case Z4: return stepperZ4.homing_threshold();
+        #endif
         default: return 0;
       }
     }
diff --git a/Marlin/src/lcd/marlinui.cpp b/Marlin/src/lcd/marlinui.cpp
index 88566713a..0be30efad 100644
--- a/Marlin/src/lcd/marlinui.cpp
+++ b/Marlin/src/lcd/marlinui.cpp
@@ -688,7 +688,9 @@ void MarlinUI::quick_feedback(const bool clear_buttons/*=true*/) {
     xyze_pos_t ManualMove::all_axes_destination = { 0 };
     bool ManualMove::processing = false;
   #endif
-  TERN_(MULTI_MANUAL, int8_t ManualMove::e_index = 0);
+  #if ENABLED(MULTI_MANUAL)
+    int8_t ManualMove::e_index = 0;
+  #endif
   AxisEnum ManualMove::axis = NO_AXIS;
 
   /**
diff --git a/Marlin/src/lcd/marlinui.h b/Marlin/src/lcd/marlinui.h
index a18a3384a..490d78401 100644
--- a/Marlin/src/lcd/marlinui.h
+++ b/Marlin/src/lcd/marlinui.h
@@ -105,9 +105,15 @@
 
 #if PREHEAT_COUNT
   typedef struct {
-    TERN_(HAS_HOTEND,     celsius_t hotend_temp);
-    TERN_(HAS_HEATED_BED, celsius_t bed_temp   );
-    TERN_(HAS_FAN,        uint16_t  fan_speed  );
+    #if ENABLED(HAS_HOTEND)
+      celsius_t hotend_temp;
+    #endif
+    #if ENABLED(HAS_HEATED_BED)
+      celsius_t bed_temp;
+    #endif
+    #if ENABLED(HAS_FAN)
+      uint16_t fan_speed;
+    #endif
   } preheat_t;
 #endif
 
@@ -123,10 +129,14 @@
       static int8_t constexpr e_index = 0;
     #endif
     static millis_t start_time;
-    TERN_(IS_KINEMATIC, static xyze_pos_t all_axes_destination);
+    #if ENABLED(IS_KINEMATIC)
+      static xyze_pos_t all_axes_destination;
+    #endif
   public:
     static float menu_scale;
-    TERN_(IS_KINEMATIC, static float offset);
+    #if ENABLED(IS_KINEMATIC)
+      static float offset;
+    #endif
     template <typename T>
     void set_destination(const T& dest) {
       #if IS_KINEMATIC
diff --git a/Marlin/src/lcd/menu/game/game.h b/Marlin/src/lcd/menu/game/game.h
index cba79e4f2..999aa7810 100644
--- a/Marlin/src/lcd/menu/game/game.h
+++ b/Marlin/src/lcd/menu/game/game.h
@@ -53,10 +53,18 @@
 
 // Pool game data to save SRAM
 union MarlinGameData {
-  TERN_(MARLIN_BRICKOUT, brickout_data_t brickout);
-  TERN_(MARLIN_INVADERS, invaders_data_t invaders);
-  TERN_(MARLIN_SNAKE, snake_data_t snake);
-  TERN_(MARLIN_MAZE, maze_data_t maze);
+  #if ENABLED(MARLIN_BRICKOUT)
+    brickout_data_t brickout;
+  #endif
+  #if ENABLED(MARLIN_INVADERS)
+    invaders_data_t invaders;
+  #endif
+  #if ENABLED(MARLIN_SNAKE)
+    snake_data_t snake;
+  #endif
+  #if ENABLED(MARLIN_MAZE)
+    maze_data_t maze;
+  #endif
 };
 
 extern MarlinGameData marlin_game_data;
diff --git a/Marlin/src/lcd/menu/menu_delta_calibrate.cpp b/Marlin/src/lcd/menu/menu_delta_calibrate.cpp
index a86ae74fc..ef9f2246c 100644
--- a/Marlin/src/lcd/menu/menu_delta_calibrate.cpp
+++ b/Marlin/src/lcd/menu/menu_delta_calibrate.cpp
@@ -119,7 +119,9 @@ void lcd_delta_settings() {
 }
 
 void menu_delta_calibrate() {
-  TERN_(DELTA_CALIBRATION_MENU, const bool all_homed = all_axes_homed()); // Acquire ahead of loop
+  #if ENABLED(DELTA_CALIBRATION_MENU)
+    const bool all_homed = all_axes_homed();  // Acquire ahead of loop
+  #endif
 
   START_MENU();
   BACK_ITEM(MSG_MAIN);
diff --git a/Marlin/src/lcd/menu/menu_probe_offset.cpp b/Marlin/src/lcd/menu/menu_probe_offset.cpp
index 3b3fa0fd2..1d62ada32 100644
--- a/Marlin/src/lcd/menu/menu_probe_offset.cpp
+++ b/Marlin/src/lcd/menu/menu_probe_offset.cpp
@@ -42,7 +42,9 @@
 // Global storage
 float z_offset_backup, calculated_z_offset, z_offset_ref;
 
-TERN_(HAS_LEVELING, bool leveling_was_active);
+#if ENABLED(HAS_LEVELING)
+  bool leveling_was_active;
+#endif
 
 inline void z_clearance_move() {
   do_z_clearance(
diff --git a/Marlin/src/libs/nozzle.cpp b/Marlin/src/libs/nozzle.cpp
index 4277e8d8d..c56f45c70 100644
--- a/Marlin/src/libs/nozzle.cpp
+++ b/Marlin/src/libs/nozzle.cpp
@@ -46,7 +46,9 @@ Nozzle nozzle;
    * @param strokes number of strokes to execute
    */
   void Nozzle::stroke(const xyz_pos_t &start, const xyz_pos_t &end, const uint8_t &strokes) {
-    TERN_(NOZZLE_CLEAN_GOBACK, const xyz_pos_t oldpos = current_position);
+    #if ENABLED(NOZZLE_CLEAN_GOBACK)
+      const xyz_pos_t oldpos = current_position;
+    #endif
 
     // Move to the starting point
     #if ENABLED(NOZZLE_CLEAN_NO_Z)
@@ -86,7 +88,9 @@ Nozzle nozzle;
     const xy_pos_t diff = end - start;
     if (!diff.x || !diff.y) return;
 
-    TERN_(NOZZLE_CLEAN_GOBACK, const xyz_pos_t back = current_position);
+    #if ENABLED(NOZZLE_CLEAN_GOBACK)
+      const xyz_pos_t back = current_position;
+    #endif
 
     #if ENABLED(NOZZLE_CLEAN_NO_Z)
       do_blocking_move_to_xy(start);
@@ -129,7 +133,9 @@ Nozzle nozzle;
   void Nozzle::circle(const xyz_pos_t &start, const xyz_pos_t &middle, const uint8_t &strokes, const float &radius) {
     if (strokes == 0) return;
 
-    TERN_(NOZZLE_CLEAN_GOBACK, const xyz_pos_t back = current_position);
+    #if ENABLED(NOZZLE_CLEAN_GOBACK)
+      const xyz_pos_t back = current_position;
+    #endif
     TERN(NOZZLE_CLEAN_NO_Z, do_blocking_move_to_xy, do_blocking_move_to)(start);
 
     LOOP_L_N(s, strokes)
diff --git a/Marlin/src/module/endstops.h b/Marlin/src/module/endstops.h
index c0cc9cdb8..13e814aa1 100644
--- a/Marlin/src/module/endstops.h
+++ b/Marlin/src/module/endstops.h
@@ -46,9 +46,15 @@ class Endstops {
   public:
     #if HAS_EXTRA_ENDSTOPS
       typedef uint16_t esbits_t;
-      TERN_(X_DUAL_ENDSTOPS, static float x2_endstop_adj);
-      TERN_(Y_DUAL_ENDSTOPS, static float y2_endstop_adj);
-      TERN_(Z_MULTI_ENDSTOPS, static float z2_endstop_adj);
+      #if ENABLED(X_DUAL_ENDSTOPS)
+        static float x2_endstop_adj;
+      #endif
+      #if ENABLED(Y_DUAL_ENDSTOPS)
+        static float y2_endstop_adj;
+      #endif
+      #if ENABLED(Z_MULTI_ENDSTOPS)
+        static float z2_endstop_adj;
+      #endif
       #if ENABLED(Z_MULTI_ENDSTOPS) && NUM_Z_STEPPER_DRIVERS >= 3
         static float z3_endstop_adj;
       #endif
diff --git a/Marlin/src/module/planner.cpp b/Marlin/src/module/planner.cpp
index 8c320925b..84c93e529 100644
--- a/Marlin/src/module/planner.cpp
+++ b/Marlin/src/module/planner.cpp
@@ -2019,9 +2019,7 @@ bool Planner::_populate_block(block_t * const block, bool split_move,
   // Bail if this is a zero-length block
   if (block->step_event_count < MIN_STEPS_PER_SEGMENT) return false;
 
-  #if ENABLED(MIXING_EXTRUDER)
-    MIXER_POPULATE_BLOCK();
-  #endif
+  TERN_(MIXING_EXTRUDER, mixer.populate_block(block->b_color))
 
   TERN_(HAS_CUTTER, block->cutter_power = cutter.power);
 
diff --git a/Marlin/src/module/planner.h b/Marlin/src/module/planner.h
index 769967d4a..24c814e85 100644
--- a/Marlin/src/module/planner.h
+++ b/Marlin/src/module/planner.h
@@ -170,7 +170,9 @@ typedef struct block_t {
     static constexpr uint8_t extruder = 0;
   #endif
 
-  TERN_(MIXING_EXTRUDER, MIXER_BLOCK_FIELD); // Normalized color for the mixing steppers
+  #if ENABLED(MIXING_EXTRUDER)
+    mixer_comp_t b_color[MIXING_STEPPERS];  // Normalized color for the mixing steppers
+  #endif
 
   // Settings for the trapezoid generator
   uint32_t accelerate_until,                // The index of the step event on which to stop acceleration
diff --git a/Marlin/src/module/servo.cpp b/Marlin/src/module/servo.cpp
index 27e5a2af2..9b71dd390 100644
--- a/Marlin/src/module/servo.cpp
+++ b/Marlin/src/module/servo.cpp
@@ -32,7 +32,9 @@
 
 HAL_SERVO_LIB servo[NUM_SERVOS];
 
-TERN_(EDITABLE_SERVO_ANGLES, uint16_t servo_angles[NUM_SERVOS][2]);
+#if ENABLED(EDITABLE_SERVO_ANGLES)
+  uint16_t servo_angles[NUM_SERVOS][2];
+#endif
 
 void servo_init() {
   #if NUM_SERVOS >= 1 && HAS_SERVO_0
diff --git a/Marlin/src/module/stepper.cpp b/Marlin/src/module/stepper.cpp
index 466f4f333..77fa6539b 100644
--- a/Marlin/src/module/stepper.cpp
+++ b/Marlin/src/module/stepper.cpp
@@ -2130,9 +2130,7 @@ uint32_t Stepper::block_phase_isr() {
       accelerate_until = current_block->accelerate_until << oversampling;
       decelerate_after = current_block->decelerate_after << oversampling;
 
-      #if ENABLED(MIXING_EXTRUDER)
-        MIXER_STEPPER_SETUP();
-      #endif
+      TERN_(MIXING_EXTRUDER, mixer.stepper_setup(current_block->b_color))
 
       TERN_(HAS_MULTI_EXTRUDER, stepper_extruder = current_block->extruder);
 
diff --git a/Marlin/src/module/temperature.h b/Marlin/src/module/temperature.h
index c9e357525..8092f1f7e 100644
--- a/Marlin/src/module/temperature.h
+++ b/Marlin/src/module/temperature.h
@@ -326,14 +326,28 @@ class Temperature {
       static const celsius_t hotend_maxtemp[HOTENDS];
       FORCE_INLINE static celsius_t hotend_max_target(const uint8_t e) { return hotend_maxtemp[e] - (HOTEND_OVERSHOOT); }
     #endif
-    TERN_(HAS_HEATED_BED, static bed_info_t temp_bed);
-    TERN_(HAS_TEMP_PROBE, static probe_info_t temp_probe);
-    TERN_(HAS_TEMP_CHAMBER, static chamber_info_t temp_chamber);
-    TERN_(HAS_TEMP_COOLER, static cooler_info_t temp_cooler);
+    #if ENABLED(HAS_HEATED_BED)
+      static bed_info_t temp_bed;
+    #endif
+    #if ENABLED(HAS_TEMP_PROBE)
+      static probe_info_t temp_probe;
+    #endif
+    #if ENABLED(HAS_TEMP_CHAMBER)
+      static chamber_info_t temp_chamber;
+    #endif
+    #if ENABLED(HAS_TEMP_COOLER)
+      static cooler_info_t temp_cooler;
+    #endif
 
-    TERN_(AUTO_POWER_E_FANS, static uint8_t autofan_speed[HOTENDS]);
-    TERN_(AUTO_POWER_CHAMBER_FAN, static uint8_t chamberfan_speed);
-    TERN_(AUTO_POWER_COOLER_FAN, static uint8_t coolerfan_speed);
+    #if ENABLED(AUTO_POWER_E_FANS)
+      static uint8_t autofan_speed[HOTENDS];
+    #endif
+    #if ENABLED(AUTO_POWER_CHAMBER_FAN)
+      static uint8_t chamberfan_speed;
+    #endif
+    #if ENABLED(AUTO_POWER_COOLER_FAN)
+      static uint8_t coolerfan_speed;
+    #endif
 
     #if ENABLED(FAN_SOFT_PWM)
       static uint8_t soft_pwm_amount_fan[FAN_COUNT],
@@ -403,11 +417,15 @@ class Temperature {
 
   private:
 
-    TERN_(EARLY_WATCHDOG, static bool inited);   // If temperature controller is running
+    #if ENABLED(EARLY_WATCHDOG)
+      static bool inited;   // If temperature controller is running
+    #endif
 
     static volatile bool raw_temps_ready;
 
-    TERN_(WATCH_HOTENDS, static hotend_watch_t watch_hotend[HOTENDS]);
+    #if ENABLED(WATCH_HOTENDS)
+      static hotend_watch_t watch_hotend[HOTENDS];
+    #endif
 
     #if ENABLED(TEMP_SENSOR_1_AS_REDUNDANT)
       static uint16_t redundant_temperature_raw;
@@ -419,22 +437,30 @@ class Temperature {
       static lpq_ptr_t lpq_ptr;
     #endif
 
-    TERN_(HAS_HOTEND, static temp_range_t temp_range[HOTENDS]);
+    #if ENABLED(HAS_HOTEND)
+      static temp_range_t temp_range[HOTENDS];
+    #endif
 
     #if HAS_HEATED_BED
-      TERN_(WATCH_BED, static bed_watch_t watch_bed);
+      #if ENABLED(WATCH_BED)
+        static bed_watch_t watch_bed;
+      #endif
       IF_DISABLED(PIDTEMPBED, static millis_t next_bed_check_ms);
       static int16_t mintemp_raw_BED, maxtemp_raw_BED;
     #endif
 
     #if HAS_HEATED_CHAMBER
-      TERN_(WATCH_CHAMBER, static chamber_watch_t watch_chamber);
+      #if ENABLED(WATCH_CHAMBER)
+        static chamber_watch_t watch_chamber;
+      #endif
       TERN(PIDTEMPCHAMBER,,static millis_t next_chamber_check_ms);
       static int16_t mintemp_raw_CHAMBER, maxtemp_raw_CHAMBER;
     #endif
 
     #if HAS_COOLER
-      TERN_(WATCH_COOLER, static cooler_watch_t watch_cooler);
+      #if ENABLED(WATCH_COOLER)
+        static cooler_watch_t watch_cooler;
+      #endif
       static millis_t next_cooler_check_ms, cooler_fan_flush_ms;
       static int16_t mintemp_raw_COOLER, maxtemp_raw_COOLER;
     #endif
@@ -447,9 +473,13 @@ class Temperature {
       static millis_t preheat_end_time[HOTENDS];
     #endif
 
-    TERN_(HAS_AUTO_FAN, static millis_t next_auto_fan_check_ms);
+    #if ENABLED(HAS_AUTO_FAN)
+      static millis_t next_auto_fan_check_ms;
+    #endif
 
-    TERN_(PROBING_HEATERS_OFF, static bool paused);
+    #if ENABLED(PROBING_HEATERS_OFF)
+      static bool paused;
+    #endif
 
   public:
     #if HAS_ADC_BUTTONS
@@ -457,7 +487,9 @@ class Temperature {
       static uint16_t ADCKey_count;
     #endif
 
-    TERN_(PID_EXTRUSION_SCALING, static int16_t lpq_len);
+    #if ENABLED(PID_EXTRUSION_SCALING)
+      static int16_t lpq_len;
+    #endif
 
     /**
      * Instance Methods
@@ -534,7 +566,9 @@ class Temperature {
 
       static constexpr inline uint8_t fanPercent(const uint8_t speed) { return ui8_to_percent(speed); }
 
-      TERN_(ADAPTIVE_FAN_SLOWING, static uint8_t fan_speed_scaler[FAN_COUNT]);
+      #if ENABLED(ADAPTIVE_FAN_SLOWING)
+        static uint8_t fan_speed_scaler[FAN_COUNT];
+      #endif
 
       static inline uint8_t scaledFanSpeed(const uint8_t target, const uint8_t fs) {
         UNUSED(target); // Potentially unused!
@@ -843,7 +877,9 @@ class Temperature {
       #endif
     #endif
 
-    TERN_(HAS_DISPLAY, static void set_heating_message(const uint8_t e));
+    #if ENABLED(HAS_DISPLAY)
+      static void set_heating_message(const uint8_t e);
+    #endif
 
     #if HAS_LCD_MENU && HAS_TEMPERATURE
       static void lcd_preheat(const uint8_t e, const int8_t indh, const int8_t indb);
@@ -866,9 +902,15 @@ class Temperature {
 
     static void checkExtruderAutoFans();
 
-    TERN_(HAS_HOTEND,     static float get_pid_output_hotend(const uint8_t e));
-    TERN_(PIDTEMPBED,     static float get_pid_output_bed());
-    TERN_(PIDTEMPCHAMBER, static float get_pid_output_chamber());
+    #if ENABLED(HAS_HOTEND)
+      static float get_pid_output_hotend(const uint8_t e);
+    #endif
+    #if ENABLED(PIDTEMPBED)
+      static float get_pid_output_bed();
+    #endif
+    #if ENABLED(PIDTEMPCHAMBER)
+      static float get_pid_output_chamber();
+    #endif
 
     static void _temp_error(const heater_id_t e, PGM_P const serial_msg, PGM_P const lcd_msg);
     static void min_temp_error(const heater_id_t e);
diff --git a/Marlin/src/module/tool_change.h b/Marlin/src/module/tool_change.h
index 5361451c8..a97b09fd8 100644
--- a/Marlin/src/module/tool_change.h
+++ b/Marlin/src/module/tool_change.h
@@ -109,9 +109,11 @@
 
 #endif
 
-TERN_(ELECTROMAGNETIC_SWITCHING_TOOLHEAD, void est_init());
-
-TERN_(SWITCHING_TOOLHEAD, void swt_init());
+#if ENABLED(ELECTROMAGNETIC_SWITCHING_TOOLHEAD)
+  void est_init();
+#elif ENABLED(SWITCHING_TOOLHEAD)
+  void swt_init();
+#endif
 
 /**
  * Perform a tool-change, which may result in moving the
diff --git a/Marlin/src/sd/cardreader.cpp b/Marlin/src/sd/cardreader.cpp
index a3e057703..53053e88d 100644
--- a/Marlin/src/sd/cardreader.cpp
+++ b/Marlin/src/sd/cardreader.cpp
@@ -1084,7 +1084,9 @@ void CardReader::cdroot() {
           #if DISABLED(SDSORT_USES_RAM)
             selectFileByIndex(o1);              // Pre-fetch the first entry and save it
             strcpy(name1, longest_filename());  // so the loop only needs one fetch
-            TERN_(HAS_FOLDER_SORTING, bool dir1 = flag.filenameIsDir);
+            #if ENABLED(HAS_FOLDER_SORTING)
+              bool dir1 = flag.filenameIsDir;
+            #endif
           #endif
 
           for (uint16_t j = 0; j < i; ++j) {