Make 2 selections/carets.
Remove 1 by using “Deselect Top/Bottom Selection from Multiple Selections” command.
Now there’s only 1 selection/caret. And it’s not multi-selection mode.
Make 2 selections/carets.
Remove 1 by using Ctrl+clicking.
Now there’s only 1 selection/caret.
** But it’s still in multi-selection mode, e.g.:
The selection has a frame.
The “Current Line Background Color” does not revert.