Helps to modify the iOS home button parameters for each new scene or canvas on awake, you may consider add just one instance per scene.
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Hide Home Button: You can hide the home button while no touches are over the screen.
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Use Padding: Adds a black frame to the bottom over the space of the home button with bazel at the corners to simulate the iPad Pro's bazel.
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Attenuate Home Button: In my opinion the sexiest way to deal with iOS Home Button for a game in Unity.