Mission Control 3 Finger Swipe Gesture Stops Working

Hello say_lez,

Welcome to Apple Support Communities!

If we understand your post correctly, when you swipe up with three fingers to launch Mission Control on your Mac it doesn't work. We'd like to help!

Let's try booting your Mac into safe mode. Booting into safe mode will disable any startup and login items from automatically opening, which can help to isolate the issue.  

"Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

1. Shut down your Mac.
2. Turn on your Mac and continue to press and hold the power button until you see the startup options window.
3. Select your startup disk, then press and hold the Shift key while clicking “Continue in Safe Mode.”
4. Log in to your Mac. You might be asked to log in again.

Intel processor

1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
2. Release the key when you see the login window, then log in to your Mac. 
3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window."

How to use safe mode on your Mac. 

If this behavior persists let's try and set up a test user account.

Set up users, guests, and groups on Mac.

Let us know if you have any questions.

Thank you for using Apple Support Communities.

Take care!