How to rotate screen to landscape when using apps that load in portrait
How to rotate 2020 IPad Pro screen to landscape when using apps that load in portrait?
iPad Pro, iPadOS 13
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If you are asking about 3rd party apps and they don't rotate, you don't. Rotation of apps has to coded into the app by the app developer. If it's not an Apple app, you should contact the app developer, but you yourself cannot make an app which wasn't programmed to rotate, rotate.