I'm on Zorin 16.1 Core. An application I use maps Ctrl+Alt+Left (similarly Right) to a set of actions in the application. However, these shortcuts don't work under Zorin.
To investigate why, I opened a keyboard testing website and it doesn't register me pressing Ctrl+Alt+Left simultaneously. Each key works fine pressed individually though. This is not a hardware issue, as this is an N-Key rollover keyboard, and the shortcut works fine in Windows.
This suggests to me that Zorin/GNOME is intercepting this shortcut. However, no such shortcut is listed in Settings > Keyboard Shortcuts. I found a similar issue on askubuntu.com, but the solutions presented there didn't work for me. Any idea how to fix this?
Yes, that was mentioned in the issue I linked. I just haven't had any luck disabling the shortcut. Zorin doesn't even support left/right workspaces though, so it's odd that this shortcut exists by default.
I installed gnome-tweaks, enabled the "Static Workspaces" option, and logged back in, but there was still no shortcut listed in Settings for switching workspaces left or right.
Interestingly, I tried enabling the "Horizontal workspaces" extension in GNOME Tweaks, and indeed Ctrl-Alt-[Left | Right] function for switching left and right between workspaces. Still, these shortcuts don't appear in Settings.
As for using gsetting to clear the shortcut, I had already tried that, as that was suggested in that page I linked earlier.
Looking at that output, it doesn't seem to match at all what I have configured in Settings. For example, it shows the close action as Alt+F4, but I have it set as Super+Q. So it look to me like the Settings application is saving the shortcuts somewhere else.
The shortcut does not exist in CLion either. Go to Help->Keyboard Shortcuts pdf; and you can see all the available keyboard shortcuts. I did not find any settings in CLion to modify the shortcuts either so I don't think that the shortcuts were changed.
The shortcut exists. It is part of my keymap (which is customizable in Settings > Keymap).
Anyways, there's a reason I didn't mention CLion in my initial post: it's irrelevant. I can reproduce the issue outside of CLion, on the keyboard testing website using Chrome. Not only that, when I enabled "Horizontal workspaces" as described above, I confirmed that Ctrl+Alt+[Left | Right] is bound to workspace switching. That is the issue.
To be clear, I appreciate your help, I just want to get across that the issue is not with CLion, so discussing CLion won't get us anywhere.
I finally got this issue fixed. Using dconf Editor, I found the problematic keybinds at /org/gnome/desktop/wm/keybindings/switch-to-workspace-[left | right]. Clearing those keybinds by setting them to  resolved my problem.