--- packag1/qtquickcontrols2/src/imports/platform/qquickplatformmenu.cpp	Mon Feb 15 10:31:52 2021
+++ package/qtquickcontrols2/src/imports/platform/qquickplatformmenu.cpp	Mon Feb 15 10:32:15 2021
@@ -803,7 +803,7 @@
 #endif
     }
     m_handle->showPopup(window,
-                        QHighDpi::toNativePixels(targetRect, window),
+                        QHighDpi::toNativeLocalPosition(targetRect, window),
                         menuItem ? menuItem->handle() : nullptr);
 }
 
--- packag1/qtquickcontrols/src/controls/qquickmenu.cpp	Mon Feb 15 11:08:45 2021
+++ package/qtquickcontrols/src/controls/qquickmenu.cpp	Mon Feb 15 11:10:02 2021
@@ -458,7 +458,7 @@
         globalTargetRect.translate(renderOffset);
         m_platformMenu->setMenuType(QPlatformMenu::MenuType(menuType));
         m_platformMenu->showPopup(parentWindow,
-                                  QHighDpi::toNativePixels(globalTargetRect.toRect(), parentWindow),
+                                  QHighDpi::toNativeLocalPosition(globalTargetRect.toRect(), parentWindow),
                                   atItem ? atItem->platformItem() : 0);
     } else {
         m_popupWindow = new QQuickMenuPopupWindow1(this);
--- packag1/qtquickcontrols2/src/quicktemplates2/qquickmenu.cpp	Tue Feb 16 13:30:48 2021
+++ package/qtquickcontrols2/src/quicktemplates2/qquickmenu.cpp	Tue Feb 16 13:31:14 2021
@@ -1270,8 +1270,13 @@
     // on desktop platforms that have a mouse cursor available and support multiple windows.
     QQmlNullableValue<QPointF> pos;
 #if QT_CONFIG(cursor)
-    if (d->parentItem && QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::MultipleWindows))
-        pos = d->parentItem->mapFromGlobal(QCursor::pos());
+    if (d->parentItem && QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::MultipleWindows)) {
+        if (auto wnd = d->parentItem->window()) {
+            if (auto scr = wnd->screen()) {
+                pos = wnd->mapFromGlobal(QCursor::pos(scr));
+            }
+        }
+    }
 #endif
 
     // As a fallback, center the menu over its parent item.