If you use MacOS and are having trouble with mission control, launch new space, I have a nice workaround for you.
I had the same issue after upgrade to Catalina, either F3 key, four finger up gesture and even a hot corner that I had configured, simply stopped to work. I fixed it doing the simple and straight forward procedure.
Open the terminal and run these following commands:
$ defaults write com.apple.dock mcx-expose-disabled -bool FALSE
$ killall DockOS Configuration:
