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Android P’s Rotation Suggestion Button is a Sneaky Good Feature
When you have auto rotate turned off, your phone’s rotation is locked, probably to portrait mode at first. However, as you rotate your phone within an app, you’ll get a rotation suggestion at bottom-right corner of the phone that allows you to flip the rotation. If you tap the button, it then flips the orientation and locks it to that until you rotate back and tap that suggestion button again.