Portrait view to landscape view on iPad
How do i unlock the screen so i can view in landscape? then how do i lock again?
iPad, iPadOS 16
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Here are the instructions for what you can do. I hope this helps.
Change or lock the screen orientation on iPad - Apple Support
Lock or unlock the screen orientation
You can lock the screen orientation so that it doesn’t change when you rotate iPad.
Open Control Center, then tap 
.
When the screen orientation is locked, 
appears in the status bar.