Not sure on the last question - there is a ‘Screen Off’ option but not sure if that turns just the Screen off or the whole Infotainment system? You’ve made me curious now so I’ll try it later.
TBH, I just leave mine displaying the bar, kw power and oil temp gauges unless it’s a rare occurrence of Sat Nav use or changing a radio channel.
Edit - sorry, just noticed yours is a slightly earlier version so stuff may have changed, but I guess it’s worthwhile having a play around in the settings.