QGuiApplication::setLayoutDirection does not change the window to RTL

Qt Support was contacted by an user that was using workaround to active RTL for Qt Quick Application window which caused for example Combobox scrolling not to work correctly.

According to https://doc.qt.io/qt-6/qtquick-positioning-righttoleft.html#default-layout-direction the RTL window should be possible to achieve via:

QGuiApplication app(argc, argv);
app.setLayoutDirection(Qt::RightToLeft); 

But this has not worked in tests.

The window controls do not setup like in example picture "WantedWindowControls".