To go to the next backdrop : Press space / click on the right arrow ( either the one on the screen or the one on the keyboard ) / click on the screen To go to the previous backdrop : click on the left arrow ( either the one on the screen or the one on the keyboard ) I know some of these aren't that funny and are sometimes a little blurry, but I will add more at your request.
Thanks to Shannon Messenger for writing the amazing KOTLC ( Keeper of the Lost Cities ) series! :)