It is a feature on apple watch which allows the user to mute their incoming notifications, while they are in a movie theatre or any other situation where they do not want to get disturbed by this notification noise. And when theatre mode is enabled in the apple watch, the watch screen stays black except when the user touch the watch.   

Read More:- https://cleanersuite.com/how-to-turn-off-on-theater-mode-on-apple-watch/

Theatre mode on Apple Watch is a great feature that allows you to mute the sound and raise the screen brightness to its highest setting, real estate Bay Are so you can easily view your watch in a crowded theater or other dark environment. This is a great way to ensure that you don't miss any important notifications coming in while you are out and about. Theatre mode is a convenient way to be able to stay connected without being disruptive to those around you.

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