Highlighted Area
I have a highlighted area (a mistaken shortcut) and most of my desktop is now in 'shade' - how do I get it back to normal - thanks. There was an editable square with a dotted line and crosses which changed the size and I couldn't get rid of it so pressed return and now there is a rectangular, highlighted area (which should be the norm) but the rest is in shade. Please help! Thanks.
MacBook Pro 15″, macOS 10.15