Keyboard shortcut to terminate editing a Message box?

Hi all-

Couldn't find anything on this:

I know I can type "m" as a shortcut to create a message box in a patcher. But unlike "n" for a new object, typing "return" doesn't terminate message box editing.

Right now, I click on the patcher canvas with my mouse, but is there a keyboard-centric way to end message box editing, and move on to another editing task?

Thanks, Charles