Docked panes can also be "pinned" or "unpinned." Pinned panes remain open when you're not using them. (All of the panes in the default layout are pinned.) Unpinned panes stay out of the way until you click on them or hover the mouse over them. Whenever you need them they "slide" open, on top of everything else, and then slide closed when you're done.
Pi nned and unpi nned panes