[Galaxy S8/S8+]How to show the home button and navigation bar?
Last Update date : Apr 21. 2022
    The Home button and the navigation bar may disappear while using certain 
  apps or functions. 
To view the Home button and the navigation bar, drag upwards from the bottom 
  of the screen. Hard press the Home button area to use the Home button when watching 
  videos in full screen. You can use the Home button even without showing the navigation bar.

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