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Navigation Keys 
Touch the Home key >    > Settings > All settings > 
Navigation keys to reverse the function of the Recent apps 
key and the Back key. 
Device 
Display 
Touch the Home key >    > Settings > All settings > 
Display to configure these options: 
  Sleep: Set the length of time of inactivity before the screen 
automatically turns off. 
  Brightness level: Set the display‟s brightness and 
auto-adjustment. 
  Auto-rotate screen: Select if the screen contents rotate 
when the phone rotates. 
  Battery percentage: Show or hide the battery percentage 
with the battery icon in the status bar. 
  Breathing light: Control breathing indicator light for 
charging, low battery, new event, and other notifications. 
  Holster mode: Turn on or off the pedometer data display 
when you use the phone in the holster. 
  Font size: Set the font size of the text on the screen. 
  Screen effect: Adjust the color of the screen. 
  Cast screen: Connect with TVs, projectors or other devices 
that support wireless display and project the phone content 
wirelessly to that device. Enable Wi-Fi and touch    > Enable 
wireless display.