I can’t rotate my screen upside down after I updated the new iOS.

I’m using IPhone 8 plus with iOS 11.4. I just updated it, before I updated my phone screen can rotate upside down but after I cannot. I didn’t turn on the screen lock and have already tried to turn off, restart the phone too. I also check another Iphone 8 plus. I wonder if it because of the iOS or something wrong with our phone?