Apple Mac OS X / MacOS: Dock keeps moving between monitors | Official Apple Support Communities
Posted by jpluimers on 2019/12/30
My Dock kept moving to another monitor every now and then.
This actually seems to be a feature but got me a while to find out what it does at [WayBack] Dock keeps moving between monitors | Official Apple Support Communities:
If you move the mouse to another window and pull it down to very bottom of the screen and hold it there, the dock moves over. To move it back, move the mouse pointer to the screen you want it on and hold the pointer at the very bottom of the screen.
This bites you when an application has features (like tools) at the very bottom of a window.
–jeroen
The Wiert Corner - irregular stream of stuff 
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