Turn off Theater Mode

Touch the bottom of your Watch screen and swipe up to see the Control Centre.

Tap the icon (2 masks) to turn Theatre Mode ON/OFF

Theater mode is turned on. Apple Watch is silenced and its display won’t light up when you raise your wrist.

If ckuan's answer doesn't work, then the first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:

How to restart your Apple Watch - Apple Support

Restart your iPhone - Apple Support

If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This should result in no loss of data. It deletes all temp and corrupted files and re-indexes the file system.

Unpair and erase your Apple Watch - Apple Support

Set up your Apple Watch - Apple Support

I cannot turn off the Theatre Mode on my watch