You can hide your navigation bar using the "Custom Navigation Bar" app. It works great, no root needed just Grant permission using adb. It'll definitely give your screen more real estate and prevent screen burn ins. Just swipe up and the navigation bar reappears with a transparent background.
https://play.google.com/store/apps/details?id=xyz.paphonb.systemuituner
https://play.google.com/store/apps/details?id=xyz.paphonb.systemuituner
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