In case your display arrangement or settings, e.g. when you have 3 screens and you are for some reason unable to reorganize them or change their settings, just reset your display settings:
For KDE Plasma:
rm -rf .local/share/kscreen
For GNOME:
rm -rf .config/monitors.xml
Then just log out and back in.
That’s it! Enjoy!
Sources:
https://askubuntu.com/questions/749333/how-can-i-reset-my-display-settings-through-terminal
Just Some Techie Notes! 
Thanks for linking to that, but did you try it yourself? I’d be VERY wary of implementing 5 year old KDE advice at this point. It’s change a LOT since then.
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Everything I write on my blog I tested first 😊
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Great! Thanks.
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works – thank you
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U just saved my life bud thanks!!!
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Reblogged this on Just Some Techie Notes! and commented:
Added GNOME
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