The Touch Assistant feature of the LG G4 smartphone is small floating menu which gives you access to common features of your phone from comfort of your screen. With the touch assistant you can for example turn off your phone, make calls, connect to the internet, take screenshots or control the volume without having to use physical buttons/softkeys. This accessibility feature is disabled by default, so here's how to enable it:
Go to Settings > General > Accessibility > Motor & cognition. Toggle Touch assistant - Show a touch board with easy access to common actions on.
That's it, the Touch Assistant board will be displayed on your screen, tap once to open it or tap and hold to change its location on your screen.