Hi guys, thank you both for responding so quickly!
I can't send anyone the file, because I'm still in trial mode; perhaps this is a limitation of the trial version, but the website didn't mention that.
I have two L-shaped corner cabinets, and when I try to customize the door configuration for either cabinet, I can only do so on one side of the L, and then the other side will mirror it. It does not allow me to select the other leg of the L at all. I can't figure out what I might have done wrong.