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Smokva - your screen shot's indicate you have two libraries with the name "Calibre-Library", I think that can only happen if they are in different locations. I suspect this is contributing to your difficulties.
The one available in Quick Switch and Rename is located at "C\:Users\<whatever>\Documents\Calibre-Library\"
You can find out where the other one is located by going into Switch/create library...
Or maybe one of them has a regular 'hyphen', and the other one has something else (en dash, zero width joiner ??)
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theducks - down here 'gone south' has same meaning, also 'belly up', and if you want to be verbose 'the whip's come of the handle'.
My main monitor did all three an hour ago when the screen broke away from its stand. In this instance an el-cheapo, die-cast joiner snapped. So I'm using a smaller lower-res job. Cost of repair would almost certainly exceed cost of a new monitor, so I just ordered a Dell S2417DG.
BR