Open Control Center on your Apple Watch
Tap the bell icon to turn on Silent Mode
On some models, swipe up from the watch face to access Control Center
On Apple Watch Ultra, press the Action button if it is set to open Control Center, then tap the bell icon
To mute alerts temporarily, cover the watch face with your palm until you feel a tap
To manage sound settings, open Settings on your Apple Watch
Tap Sounds & Haptics
Turn on Silent Mode
Adjust alert volume with the volume slider if needed