How... do I close it?
Really the only thing I ended up doing was: New Panel > Properties (on new panel) > deselect Expand (under General tab) > Move it to the desired screen > re-select expand > then add the appropriate functions you want for that screen through the Add to Panel function.
Now this effectively gives me 16 work-spaces instead of 4 if I still use the workspace switcher, but that's not really an issue.
As for the background image it seems my background image was so large (over 100 MB) that it bugged out that part of the GUI when I added another screen. I played around with the settings some more, and found that it was the only image that had this issue. So restarting the computer and setting the Style to Scale resolved that issue.