getting stuck in windows with no speech

I have been working with dnome 2.4 and gnopernicus for the last few days.
Periodically, I get into a window which has no speech, and cannot seem to get back out of it.
I have tried <backspace>, <alt+f4> <esc> nothing seems to work.
The latest window where this happened was the server settings window.
1.    Is there a way to get out of such a window?
2.    Why would a window like this be inaccessible?

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