I have a 2012, but I assume the menus are the same for the 2011s. This is from memory, so the titles won't be identical:
Menu | Navigation Settings | User Settings
In that menu, you will see Map Colors, and the second or third item will show you the map type. You can have list, split screen, etc. That's the setting you want to change. You are set to the split screen view.
To turn off gas stations, that is in the POI menu. While the car is in Park, you can press the POI button on the bottom of the map screen and it probably will show you that the gas stations are being displayed (indicated as the icon in the top row of POIs being displayed). You can choose it to stop displaying.
Or if you didn't understand my descriptions, the manual probably describes it better.