The basic screen is 8 inches diagonal, which is nothing special, merely better than a 7-incher. (Main photo shows 10-inch display.) The Bigger the Screen, the More It Does The bigger the display - 8, 10 or 15.5 inches - the more information and tiles the driver and passenger see.
Ford Sync 4 15.5-inch portrait display with temperature slider, phone, and music screens.