User manual

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enable Virtual Navigation Keys Can Be Hidden. Then you can click on the
left-lower corner of the screen to hide the keys, and swipe from the bottom to
reveal them.
Immersive navigation background.The system set multiple colors for the
navigation background to match the color scheme of the popular apps. The
background color is default white, and it will become translucent or immersive
when you open some of the third-party apps.