When you don’t want to hear alerts and notifications on Apple Watch, you can turn on Silent Mode, Theater Mode, Do Not Disturb, or a Focus. You can also cover the display to temporarily mute an alert.
Use Silent Mode to mute all alerts, notifications, and sound effects. You still receive haptic notifications.
Note: While Apple Watch is charging, alarms and timers still sound, even in Silent Mode.
Press the Change notification settings on Apple Watch