Index: sources/gui/qml/pages/treatment/sections/TreatmentFlowsComponent.qml
===================================================================
diff -u -r3e682c5afdadcf4dd2006e3d975fbee58e48619e -rc2f474ff07c98aa350c445a2474976a3cf985f40
--- sources/gui/qml/pages/treatment/sections/TreatmentFlowsComponent.qml	(.../TreatmentFlowsComponent.qml)	(revision 3e682c5afdadcf4dd2006e3d975fbee58e48619e)
+++ sources/gui/qml/pages/treatment/sections/TreatmentFlowsComponent.qml	(.../TreatmentFlowsComponent.qml)	(revision c2f474ff07c98aa350c445a2474976a3cf985f40)
@@ -1,7 +1,10 @@
 
 // Qt
 import QtQuick 2.12
+import QtGraphicalEffects 1.12
+/* Qt6 Port: replaced the above import with the following one:
 import QtQuick.Effects
+*/
 
 // Project
 
@@ -146,9 +149,20 @@
     }
 
     layer.enabled   : _root.dropShadowEnabled && _root.showButtons
+    layer.effect    : DropShadow { id: _dropShadow
+        horizontalOffset: 3
+        verticalOffset  : 3
+        radius          : 3.0
+        samples         : 7
+        color           : "#50000000"
+        source          : _root
+        anchors.fill    : _root
+    }
+/* Qt6 Port: replace the above DropShadow with the following RectangularShadow:
     layer.effect    : RectangularShadow { id: _dropShadow
         radius          : 3.0
         color           : "#50000000"
         anchors.fill    : _root
     }
+*/
 }