diff --git a/src/Qt5/imports/FluentUI/Controls/FluWindow.qml b/src/Qt5/imports/FluentUI/Controls/FluWindow.qml
index d7c19bd0..94fd29eb 100644
--- a/src/Qt5/imports/FluentUI/Controls/FluWindow.qml
+++ b/src/Qt5/imports/FluentUI/Controls/FluWindow.qml
@@ -201,7 +201,7 @@ Window {
         id:layout_content
         anchors.fill: parent
         anchors.margins: {
-            if(FluTools.isWin()){
+            if(FluTools.isWin() && !window.useSystemAppBar){
                 return window.visibility === Window.Maximized ? 8 : 0
             }
             return 0
diff --git a/src/Qt6/imports/FluentUI/Controls/FluWindow.qml b/src/Qt6/imports/FluentUI/Controls/FluWindow.qml
index 15d72689..7b817bb8 100644
--- a/src/Qt6/imports/FluentUI/Controls/FluWindow.qml
+++ b/src/Qt6/imports/FluentUI/Controls/FluWindow.qml
@@ -200,7 +200,7 @@ Window {
         id:layout_content
         anchors.fill: parent
         anchors.margins: {
-            if(FluTools.isWin()){
+            if(FluTools.isWin() && !window.useSystemAppBar){
                 return window.visibility === Window.Maximized ? 8 : 0
             }
             return 0