the wallpaper is meant to go from the farthest left of the scene and move as you move to different screens, which doesn't make it work particularly well for most things. I've got a formula 1 car for mine, and on the farthest left screen I can see an entire tire, but by the last screen, it's no longer there and you can see part of the other one. You just have to experiment until the main screen gets the section you want.