iPhone won’t switch from vertical to horizontal automatically
iPhone automatic switching of the vertical screen to horizontal screen stopped, now just at displays vertical aspect
iPhone 11, iOS 16
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Some apps don't support rotation, so your screen may not rotate even if Portrait Orientation Lock is turned off.
Rotate the screen on your iPhone or iPod touch
- Swipe down from the top right-hand corner of your screen to open Control Centre.
- Tap the Portrait Orientation Lock button to make sure that it's off.
- Turn your iPhone sideways.
Rotate the screen on your iPhone or iPod touch - Apple Support