How to stop screen from rotating

“Lock or unlock the screen orientation in iOS 12

You can lock the screen orientation so that it doesn’t change when you rotate iPad.

Open Control Center, by swiping down from the upper right corner of the iPad’s screen.

Then tap the circular arrow icon with lock symbol in the center.

When the screen orientation is locked, the screen lock circular arrow symbol appears in the iPad’s status bar.”

Excerpt From: Apple Inc. “iPad User Guide for iOS 12.1.1.” Apple Inc., 2018. iBooks.

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Check out this book on the iBooks Store: https://itunes.apple.com/us/book/ipad-user-guide-for-ios-12-1-1/id1420662722?mt=11

From the home page swipe down from the upper right corner and you should see the control center. the rotation lock is there.