This isn't a question but I had this problem for a while. I saw this solution after searching online.
The mission control can be fixed using the Terminal:
Just copy and paste. I hope it helps.
interesting solution. If it is working, generally this means something else is corrupting the system preferences. Don't use any optimizers on your Mac.
MacKeeper, MacPaw, Zeobit, Advanced Mac Cleaner are all utilities that damage such preferences without trying too. If you have these, don't use them and remove them with Reggie Answorth's AppDelete.
interesting solution. If it is working, generally this means something else is corrupting the system preferences. Don't use any optimizers on your Mac.
MacKeeper, MacPaw, Zeobit, Advanced Mac Cleaner are all utilities that damage such preferences without trying too. If you have these, don't use them and remove them with Reggie Answorth's AppDelete.
How to fix F3 or Mission Control that is not working.
