Could not find that setting in Catalyst Control (card software driver/setting software) because this is where the problem most likely is. Both monitors are identified, resolution set to highest (1920 X 1080).
In the windows 7 display setting it is all set correctly - to span.
I am pretty sure it has to be in the setting of the card driver (then MS flight sim would see it correctly). I might re-install car driver.
Wndows 7 settings will span desktop wallpaper, not apps. Yo have to go to eyefinity in CCC and create a display group.