Dock
Keep the Dock where you want it, bring it back when it disappears, and tune how it behaves.
- Mac Dock keeps moving to the other monitor? How to keep it on one screenThe Dock follows your pointer to whichever display you push against the bottom edge of. Here's why it happens and three ways to keep it on one screen.
- Dock not showing on your external monitor (or missing entirely) on MacHow to bring the Dock to an external display, and what to do when the Dock disappears or won't show at all, including the reset command.