When a monitor connects, a panel drops out of the MacBook notch with every open window, full screen apps and other desktops included. Tick what moves and it glides across; unplug and it all comes home. Full screen apps move behind a calm curtain instead of macOS's flashing. Remembers a layout per screen setup, puts windows back after sleep, keeps your monitor arrangement, tiles up to four apps, and has shortcuts that never clash with macOS. 7 days free, then $2.99 once.