How do I get out of 'screen' without typing 'exit'?

linux gnu-screen

Ctrl-a d or Ctrl-a Ctrl-d. See the screen manual # Detach.

linux gnu-screen

Ctrl + A, Ctrl + \ - Exit screen and terminate all programs in this screen. It is helpful, for example, if you need to close a tty connection.
Ctrl + D, D or - Ctrl + A, Ctrl + D - "minimize" screen and screen -r to restore it.

linux gnu-screen

Ctrl + A and then Ctrl+D. Doing this will detach you from the screen session which you can later resume by doing screen -r.
You can also do: Ctrl+A then type :. This will put you in screen command mode. Type the command detach to be detached from the running screen session.