For those who want to have a better smartphone experience, You can map the volume buttons to use as a shortcut key.
I use 6 shortcuts with smartphone volume button. The app I use is the (Key Mapper, e o Key Mapper Gui Keyboard )
For example: shortcut (Tab (full screen)= Volume button (-) or (+) (long press)
And for those who have smartphone compatible with screem mirro , you can mirror your mobile phone with the TV , with hdmi or Wificast .