There have been changes to Pop!_OS Keyboard Shortcuts. Check out the link below ...
https://support.system76.com/articles/pop-keyboard-shortcuts/
Also, when things get weird graphically (cause they do with Linux) and you are using gnome; restart your gnome session using ALT+F2 and then enter 'restart'. This fixes a lot of weird graphical issues, especially if you are using dual monitors.
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