Press and hold the Side button and Volume Down button at the same time
Tap Power off on the screen
Tap Power off again to confirm
If the power menu does not appear, go to Settings
Tap Advanced features
Tap Side button
Select Power off menu
Then press and hold the Side button and Volume Down button again
If needed, use the Quick Settings panel
Swipe down from the top of the screen
Tap the Power icon
Tap Power off
Tap Power off again to confirm