little blank rectangle on my desktop
Somehow (I was looking in Preferences, I think) a small blank rectangle appeared on my desktop, and it won't go away. Nor does it seem to have any use. How do I remove it?
I know that GIYF, but I have no idea, how to query for something for which you do not even know the name.
I am currently running Linux Mint XFCE, if that is relevant.