MacOS – can I disable F12, Ctrl-Left Arrow, Ctrl-Right Arrow

I've noticed that certain applications seem to trap the gestures, even when they're no longer active.

The only time I've been able to 100% narrow down something trapping various shortcut keys was with either Apple Remote Desktop (the built in screen sharing functions), or Microsoft Remote Desktop.

Even though I clicked outside of the app and started using something else, something caused notably my ctrl+←/→ to stop working.

I unfortunately do not remember the specific steps I took to resolve the issue. Whether it was explicitly sending focus into the remote connection window, and then (with the mouse only) explicitly out of the window, and onto another app that is not just the Desktop, might have fixed the problem. Otherwise, I may have just closed the window in frustration.

Either way, this issue is one that you may have to do some personal diagnosing to figure out. Check for any running apps that are notably not native (Java, AIR-based, etc.), or have some other form of deep integration (trapping keyboard events and sending them to another computer is pretty deep), that may be causing this issue.

Will have to go into system preferences, keyboard, shortcuts, and then assign a specific key to activate Mission Control. You can do this either in your host machine or in the remote one. What matters is that the shortcut for the remote machine is not used in the local machine.

You can do the same directly for the ^right and ^left shortcuts. Change them in one of the two machines and then they will work in the remote one.

For example I indicated the F10 to be mission-control on my remote computer, so whenever I press FN+10 I'll get mission control on the remote Computer