Well, here is what I had already done and IT WORKS (sort of). I changed
the REVEAL MODE to BOTTOM. The result is that when I go on to something
else and I am no longer on the desktop, the LAUNCHER disappears
completely on the left-hand side. It does not reappear at all when I go
to the left-hand edge. I thought it would become visible when I put my
mouse pointer at the bottom edge, but NO, it does not come up. But when
I hit the Super key, it brings up the DASH, not the LAUNCHER. So, that
works for me for now....