Apple Watch alarm

Sometimes when I have set an alarm on my Apple Watch and go to turn it off I hit the wrong button on the screen, the sound changes and then I can’t find how to turn it off.

I normally resort to turning the whole watch off to get it to stop. What do I need to do to turn it off without turning the watch off?

I have closed all the apps open on the watch thinking that I might do it and it still sounds.

Any ideas would be appreciated.