Work area
Windows reports a work area per monitor. DeskDrawer places and re-tiles boards within it, which is why a board never ends up half-hidden behind the taskbar even after a resolution change or a taskbar move.
When the work area changes — a monitor is unplugged, the resolution changes, the taskbar moves to another edge — boards that fall outside it can be corrected with Fix misplaced boards in the Tray menu. Boards that are still in a valid position are left exactly where they are.