Use the Volume buttons to adjust the volume of songs and other media, and of alerts and sound effects. Use the Side Switch to silence audio alerts and notifications. Or, set it to prevent iPad from switching between portrait and landscape orientation.
Adjust the volume. Press the Volume buttons.
Mute notifications, alerts, and sound effects. Slide the Side Switch toward the Volume buttons. The Side Switch doesn't mute the audio from music, podcasts, movies, and TV shows.
Use the Side Switch to lock the screen orientation. Go to Settings > General, then tap Lock Rotation.
You can also use Do Not Disturb to silence FaceTime calls, alerts, and notifications.
Set iPad to Do Not Disturb: Swipe up from the bottom edge of the screen to open Control Center, then tap . Do Not Disturb keeps alerts and notifications from making any sounds or lighting up the screen when the screen is locked. Alarms, however, still sound. If the screen is unlocked, Do Not Disturb has no effect.
To schedule quiet hours, allow FaceTime calls from specific people, or allow repeated FaceTime calls to ring through, go to Settings > Do Not Disturb (see Basics section -> Do Not Disturb).