Just got a new mac and while I had disabled this on my old one, everything’s moved around and I can’t figure out how to get rid of this.
I don’t use the multiple desktops thing and I like to use the Magnet app for window snapping. At the moment I can’t drag the window to the top of the screen to make it occupy the full size of the screen using Magnet because instead it opens up the ribbon at the top for managing multiple desktops.
You can disable Mission Control and Spaces by typing the following command in terminal:
defaults write com.apple.dock mcx-expose-disabled -bool TRUE && killall Dock
If for some reason you want it back you can type in the following into terminal:
defaults delete com.apple.dock mcx-expose-disabled && killall Dock
You can google the commands above to check the authenticity of my answer. Hope this helps. 😊