Design Studio Error : This type (ApplicationWindow) is not supported as a root element by Qt Quick Designer. (M208)

[Omar3]

Going through the same issue. I'm circumventing it for now by creating a separate QML (View01.qml) file and importing that file into the ApplicationWindow file (Window.qml). I am able to edit View01.qml in Design studio. But Python calls Window.qml.

[Zebeqo]

Same issue.

[caicx]

Same issue

[Qboi]

Same here, only thing working is using older versions of QT creator. But what if I want to use newer versions?

[A Former User]

Same issue

[QtBeginner2022]

might be understood...
The 'ApplicationWindow', as you can see under https://doc.qt.io/qt-6/qml-qtquick-controls2-applicationwindow.html: Detailed Description is (noadays and consequently) a relict of the times of classical design with 'Menu', 'Header', 'Content' and 'Footer'. It seems to be that in the new world such a strickt design of a program, a application, in the times of button driven 'apps' it is not anymore a part of the Qt Quick Designer, means not of any future creation or design tool Qt offers.
I learned tonight quite quick to pass by this decission made by Qt.
So my suggestion: forget about 'ApplicationWindow'. Arrange yourself with 'window' and the news syntax... --- it is very simple.

[Service IT]

Change "ApplicationWindow" To "Window"
and add "import QtQuick.Window 2.1"

[Muthe Rodriguez]

@Service-IT Great !!! Thank you !!

[Aritra Ranjan Chowdhury]

@Service-IT
No In that case Menubar feature is not work

[Azmuth]

This post is deleted!