Since I installed windows 11 some windows do not disappear when closed

[Pit Hauge]

Regardless of whether the program closes the window or I press the close button, the window remains visible and covers everything underneath. When I click on the window, the program underneath reacts.The behavior only seems to occur with dialog and progress windows.The "About..." window of the DynaGeo program on the screenshot is an example of this.It doesn't respond to any keystrokes. If I activate DynaGeo via the taskbar and call up the "About..." dialog there, I can move the "About..." window. Clicking the OK button makes it inactive again, but it remains visible in the foreground.

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