Android Studio 4.1.1 macOS Full Screen Error
Go to the Apple Menu, select System Preferences > General. In the Prefer tabs when opening documents option, select "never". Then restart Android Studio.
System Preferences > General > set Prefer Tabs to never when opening documents.
Alternatively, run this on Terminal and restart Android Studio:
defaults write com.google.android.studio AppleWindowTabbingMode manual
This works while keeping the tabs active for other apps.
I solved by clicking the -> System Preferences -> General -> Prefer Tabs and select "never". I have no problem using the latest version of IDEA, it may be that the version of IDEA on which Android Studio is based low.