[Q] Issue setting wallpaper scaling topic

I just tried setting an image as my wallpaper. The first time I did it asked me to scale/crop it down to where I'd like it to be. I did that, and didn't like how it looked so wanted to go back and rescale. Well, every time I go back and try to set it as wallpaper again, it doesn't give me the option to scale/crop it how I'd like. What do I need to do to get that option back?