From within the Settings app, tap Focus.
Tap Do Not Disturb.
From this screen, you can view and edit your Do Not Disturb options.
To turn Do Not Disturb on, drag down from the top right portion of your screen to access the Control Center.
Tap Focus to view your current Focus options.
Tap Do Not Disturb.
Tapping Do Not Disturb again will turn it OFF.
You've completed the steps!
