How do I close Discover window once opened? There is no X in the upper right corner

After I open the Discover app, there is no X in the upper right corner to close the window. How do I close it?
I am running Discover 6.1.5 and KUbuntu 24.10.

This sounds unusual. Can you attach a screenshot that shows the problem?

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Normally, AltF4 will do it.

AltF3 should show a Window menu.

However, something else is wrong here…