I’ve been hit with the dreaded battery drain issue (S8, sw version 21s67). So I decided to shut down the watch instead of letting this massive drain go on and potentially impact the battery only to notice that the actual option to shut the watch down is gone.
If I go to Settings - > General - > Shut Down, I am presented with 3 options (Medical, Backtrack, Emergency SOS). It seems there is no way to shut the watch down other than letting the battery die?
As others have said, there is a little power button on the top right, but if that doesn’t work you can do a soft reboot, by holding down the crown and action button until you see the apple logo.
That’s a hard reboot, not soft, and it doesn’t solve OP’s problem because it doesn’t result in a shutdown.