BMW professional sat nav E92

[ogbert@11]

Hi,

Just bought a 3 series coupe (E92 2006)with professional sat nav. I've seen a picture that uses the full screen (when in map mode or radio, etc )on an advert but can't get it to work on mine. I've sussed how to use the assistance window but when I close it the window just goes to a BLANK SCREEN, wasting nearly half the screen...pls can anyone help,

Cheers,

D