All of the sudden

[Sweater]

My screen won't rotate. I checked the settings. 

[Alilo]

Did you try to reboot it?

[ShaunE314]

Swipe down twice and look for screen rotate in your bubbles

[LongHiker]

@Sweater Try this:

1. Look for this icon and click it. 

2. That will enable Auto rotate and the icon will turn into this.