Center display in gauge cluster

Can someone please explain how the display is set up. I know there is a switch to go back and forth between modes and a button on the wiper stalk. But whats the difference when you press the bottom button and is shows a 1 or 2 or turns the screen off? Also what are all the readouts? I got the remaining miles per tank and the real time MPG but what is everything else?

Sorry stupid question now that I figured it out.