I had my fullscreen editor background set to a very nice typewriter sort of thing. And then I changed it to be my new book cover, just to see what that would look like. It looked terrible. Nice cover, bad background.
Anyway, now no matter what I do, it won’t change back. It stays as my cover. I tried deleting the cover from the project, deleting it from my hard drive. I reset the background numerous times. I even tried setting it to a solid color with no texture. It doesn’t change. Always that damn cover.
“If I set the full screen background from the Tools > Options > Appearance menu, it had no effect.” That is because that setting sets the background colour for fullscreen without a background picture loaded. It is for a plain coloured screen, and it does work. It is just that that setting is not for changing the background picture.
But there is an option there as well for “Choose Texture” that lets you load an image file. That’s how I originally had my fullscreen background applied. It does the exact same thing, if the image you choose is big enough and iif there’s no background selected under the View > Full Screen Backdrop menu option.