I think my computer has two desktops - I have no idea how to remove the second one which I never use, not that I know how to use it anyway. If I take my mouse pointer out of the upper bounds of my visible desktop and slide it up high and then bring it back down, it takes a lot of sliding before I can see it back on my visible desktop. More importantly when I take a screen capture, it shows a blank desktop above whatever is visible to me.
I have no idea what to do. How can I resolve this?