If you are having trouble with your iPhone’s settings, including the screen rotation feature, you can try resetting all of your iPhone’s settings to their defaults. This is a step before performing a factory reset. Your saved files and logins will not be affected, but you will need to set up preferences like alarms and Wi-Fi connections again. While it can be annoying, this is the best option when you can’t access your settings properly.
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Open the Settings app.
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Select the General settings.
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Select Reset.
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Select Reset All Settings.
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Enter your iPhone PIN to confirm the reset.
After your iPhone reboots, all of your settings, including the screen rotation setting, should be restored to their defaults. If your iPhone is still not working properly, you can follow these same steps, but choose “Erase All Content and Settings” in the Reset menu to perform a factory reset. However, please note that this will erase all of your saved files and settings, which may not be necessary for fixing a stuck screen.