When I open the Settings popup modal window by clicking on the cogwheel at the very bottom/left of Capacities Windows App (Windows 11), the close button (X) in this is dead. The window can be closed using the Escape key or by klicking outside the window. So this bug is not dramatic. But it is still a bug.

This bug has been there for some versions now and still is present in my current version v1.41.6.