Press and hold the Side key and Volume Down key together
Tap Power off on the screen
Tap Power off again to confirm
If your phone has a Power key, press and hold it
Tap Power off
Tap Power off again to confirm
If the screen is frozen, press and hold the Side key and Volume Down key for 10 to 15 seconds until the phone turns off
If needed, open the Quick Panel and tap the Power icon
Tap Power off
Tap Power off again to confirm