diff --git a/Marlin/src/lcd/extui/dgus_reloaded/DGUSRxHandler.cpp b/Marlin/src/lcd/extui/dgus_reloaded/DGUSRxHandler.cpp
index df36d25426c03..3148215439de6 100644
--- a/Marlin/src/lcd/extui/dgus_reloaded/DGUSRxHandler.cpp
+++ b/Marlin/src/lcd/extui/dgus_reloaded/DGUSRxHandler.cpp
@@ -230,13 +230,9 @@ void DGUSRxHandler::Flowrate(DGUS_VP &vp, void *data_ptr) {
   switch (vp.addr) {
     default: return;
     case DGUS_Addr::ADJUST_SetFlowrate_CUR:
-      #if EXTRUDERS > 1
-        ExtUI::setFlow_percent(flowrate, ExtUI::getActiveTool());
-      #else
-        ExtUI::setFlow_percent(flowrate, ExtUI::E0);
-      #endif
+      ExtUI::setFlow_percent(flowrate, TERN(HAS_MULTI_EXTRUDER, ExtUI::getActiveTool(), ExtUI::E0));
       break;
-    #if EXTRUDERS > 1
+    #if HAS_MULTI_EXTRUDER
       case DGUS_Addr::ADJUST_SetFlowrate_E0:
         ExtUI::setFlow_percent(flowrate, ExtUI::E0);
         break;
@@ -558,9 +554,7 @@ void DGUSRxHandler::FilamentSelect(DGUS_VP &vp, void *data_ptr) {
     default: return;
     case DGUS_Data::Extruder::CURRENT:
     case DGUS_Data::Extruder::E0:
-    #if EXTRUDERS > 1
-      case DGUS_Data::Extruder::E1:
-    #endif
+    TERN_(HAS_MULTI_EXTRUDER, case DGUS_Data::Extruder::E1:)
       dgus_screen_handler.filament_extruder = extruder;
       break;
   }
@@ -591,14 +585,14 @@ void DGUSRxHandler::FilamentMove(DGUS_VP &vp, void *data_ptr) {
   switch (dgus_screen_handler.filament_extruder) {
     default: return;
     case DGUS_Data::Extruder::CURRENT:
-      #if EXTRUDERS > 1
+      #if HAS_MULTI_EXTRUDER
         extruder = ExtUI::getActiveTool();
         break;
       #endif
     case DGUS_Data::Extruder::E0:
       extruder = ExtUI::E0;
       break;
-    #if EXTRUDERS > 1
+    #if HAS_MULTI_EXTRUDER
       case DGUS_Data::Extruder::E1:
         extruder = ExtUI::E1;
         break;
diff --git a/Marlin/src/lcd/extui/dgus_reloaded/DGUSTxHandler.cpp b/Marlin/src/lcd/extui/dgus_reloaded/DGUSTxHandler.cpp
index f4671f6a2d16c..7c1c45d473247 100644
--- a/Marlin/src/lcd/extui/dgus_reloaded/DGUSTxHandler.cpp
+++ b/Marlin/src/lcd/extui/dgus_reloaded/DGUSTxHandler.cpp
@@ -249,13 +249,9 @@ void DGUSTxHandler::Flowrate(DGUS_VP &vp) {
   switch (vp.addr) {
     default: return;
     case DGUS_Addr::ADJUST_Flowrate_CUR:
-      #if EXTRUDERS > 1
-        flowrate = ExtUI::getFlow_percent(ExtUI::getActiveTool());
-      #else
-        flowrate = ExtUI::getFlow_percent(ExtUI::E0);
-      #endif
+      flowrate = ExtUI::getFlow_percent(TERN(HAS_MULTI_EXTRUDER, ExtUI::getActiveTool(), ExtUI::E0));
       break;
-    #if EXTRUDERS > 1
+    #if HAS_MULTI_EXTRUDER
       case DGUS_Addr::ADJUST_Flowrate_E0:
         flowrate = ExtUI::getFlow_percent(ExtUI::E0);
         break;
@@ -363,7 +359,7 @@ void DGUSTxHandler::FilamentIcons(DGUS_VP &vp) {
   switch (dgus_screen_handler.filament_extruder) {
     default: return;
     case DGUS_Data::Extruder::CURRENT:
-      #if EXTRUDERS > 1
+      #if HAS_MULTI_EXTRUDER
         switch (ExtUI::getActiveTool()) {
           default: break;
           case ExtUI::E0:
diff --git a/Marlin/src/lcd/extui/dgus_reloaded/config/DGUS_Addr.h b/Marlin/src/lcd/extui/dgus_reloaded/config/DGUS_Addr.h
index de64fe2b106b7..00cdecb6895dc 100644
--- a/Marlin/src/lcd/extui/dgus_reloaded/config/DGUS_Addr.h
+++ b/Marlin/src/lcd/extui/dgus_reloaded/config/DGUS_Addr.h
@@ -55,7 +55,7 @@ enum class DGUS_Addr : uint16_t {
   STATUS_Resume             = 0x2009, // Popup / Data: DGUS_Data::Popup
   ADJUST_SetFeedrate        = 0x200A, // Type: Integer (16 bits signed)
   ADJUST_SetFlowrate_CUR    = 0x200B, // Type: Integer (16 bits signed)
-  #if EXTRUDERS > 1
+  #if HAS_MULTI_EXTRUDER
     ADJUST_SetFlowrate_E0   = 0x200C, // Type: Integer (16 bits signed)
     ADJUST_SetFlowrate_E1   = 0x200D, // Type: Integer (16 bits signed)
   #endif
@@ -113,7 +113,7 @@ enum class DGUS_Addr : uint16_t {
   STATUS_Icons              = 0x30F7, // Bits: DGUS_Data::StatusIcon
   ADJUST_Feedrate           = 0x30F8, // Type: Integer (16 bits signed)
   ADJUST_Flowrate_CUR       = 0x30F9, // Type: Integer (16 bits signed)
-  #if EXTRUDERS > 1
+  #if HAS_MULTI_EXTRUDER
     ADJUST_Flowrate_E0      = 0x30FA, // Type: Integer (16 bits signed)
     ADJUST_Flowrate_E1      = 0x30FB, // Type: Integer (16 bits signed)
   #endif
diff --git a/Marlin/src/lcd/extui/dgus_reloaded/definition/DGUS_VPList.cpp b/Marlin/src/lcd/extui/dgus_reloaded/definition/DGUS_VPList.cpp
index 3f5690cfe7bd2..486f00f6ed08d 100644
--- a/Marlin/src/lcd/extui/dgus_reloaded/definition/DGUS_VPList.cpp
+++ b/Marlin/src/lcd/extui/dgus_reloaded/definition/DGUS_VPList.cpp
@@ -92,7 +92,7 @@ const struct DGUS_VP vp_list[] PROGMEM = {
 
   VP_HELPER_RX(DGUS_Addr::ADJUST_SetFeedrate,     &DGUSRxHandler::Feedrate),
   VP_HELPER_RX(DGUS_Addr::ADJUST_SetFlowrate_CUR, &DGUSRxHandler::Flowrate),
-  #if EXTRUDERS > 1
+  #if HAS_MULTI_EXTRUDER
     VP_HELPER_RX(DGUS_Addr::ADJUST_SetFlowrate_E0,  &DGUSRxHandler::Flowrate),
     VP_HELPER_RX(DGUS_Addr::ADJUST_SetFlowrate_E1,  &DGUSRxHandler::Flowrate),
   #endif
@@ -194,7 +194,7 @@ const struct DGUS_VP vp_list[] PROGMEM = {
   VP_HELPER_TX_AUTO(DGUS_Addr::ADJUST_Flowrate_CUR,
                     nullptr,
                     &DGUSTxHandler::Flowrate),
-  #if EXTRUDERS > 1
+  #if HAS_MULTI_EXTRUDER
     VP_HELPER_TX_AUTO(DGUS_Addr::ADJUST_Flowrate_E0,
                       nullptr,
                       &DGUSTxHandler::Flowrate),
diff --git a/Marlin/src/lcd/extui/mks_ui/wifi_module.cpp b/Marlin/src/lcd/extui/mks_ui/wifi_module.cpp
index 998393ebd59e9..58b6d7e8d475a 100644
--- a/Marlin/src/lcd/extui/mks_ui/wifi_module.cpp
+++ b/Marlin/src/lcd/extui/mks_ui/wifi_module.cpp
@@ -987,11 +987,11 @@ static void wifi_gcode_exec(uint8_t *cmd_line) {
                   if (card.isFileOpen()) {
                     //saved_feedrate_percentage = feedrate_percentage;
                     feedrate_percentage = 100;
-                    #if EXTRUDERS
+                    #if HAS_EXTRUDERS
                       planner.flow_percentage[0] = 100;
                       planner.e_factor[0] = planner.flow_percentage[0] * 0.01f;
                     #endif
-                    #if EXTRUDERS == 2
+                    #if HAS_MULTI_EXTRUDER
                       planner.flow_percentage[1] = 100;
                       planner.e_factor[1] = planner.flow_percentage[1] * 0.01f;
                     #endif