I have an Image plane I done with but I can't figure out how to delete it. I've tried to simply highlight it and delete it, highlight it in the outliner (at least I think "side shape" is the image plane).

I also tried to just hide it, which I could do in all windows except the side view. And now I can't even highlight it in that view.

Is there a right way to delete image planes? What am I don't wrong. It seems it should be easy to do.

Thanks!