Qt Creator Design mode disabled for Qt Quick / PySide6 project

Question:

In newly installed Qt Creator 8.0.1, the Design Mode is disabled. I can only code in QML in Edit Mode.

I can easily reproduce the problem by just creating a new Python Qt Quick Project as shown below. The Design Button on the left menu is always disabled.

enter image description here

I tried to add all modules related to the Design Mode with Qt maintenance tool, but it’s still disabled.
I really get stuck on this configuration problem.

Asked By: u2gilles

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Answers:

You can enable the QmlDesigner by going to Help > About Plugins… and using the filter to find QmlDesigner. Activate the CheckBox and restart QtCreator.

https://www.qt.io/blog/qt-creator-6-released

The integrated Qt Quick Designer is now disabled by default. Qt
Creator will open .ui.qml files in Qt Design Studio. This is a step
towards a more integrated workflow between Qt Design Studio and Qt
Creator (video). Qt Quick Designer is still there, you can manually
enable it again by checking the QmlDesigner plugin in Help > About
Plugins.

Answered By: iam_peter