Turning  watch display off at night

It’s more of a statement

you can create a shortcut to turn theatre mode on at a specific time and with another shortcut to turn it on, it will happen automatically then.

create a shortcut I called mine Theatre on and the other one as off.

when you search for command it is “Cinema Mode” rather than “Theatre Mode”

then create an automation to run it at time you want it turned off/ on