Qt Quick Form Editor don't show components

[KasV]

I'm new and i installed Qt Creator and pyside2. Now i want to create my first UI but something seems to be broken in the Form Editor. When i open the Design tab the programm is executed multile times and in the Form Editor is only the little mark on the top left side of a component visible. In all videos there was the window and you can drag and drop new components in that but in my case this is not possible. I'm not sure if i missed something in the installation process or if there is another setting.
Thanks for help

[BramH]

Same issue, does anyone have a fix?