Hi Mark. I'm Greg, 10 years awarded Windows MVP, here to help you.
You can enable the setting for Ease cursor movement between monitors here:
https://www.elevenforum.com/t/turn-on-or-off-ea...
Let's try all the available fixes for cursor sticking in dual monitors.
You said it sticks at the top and bottom of the main screen. Are the monitors arranged vertically or horizontally. Is it getting stuck between the two?
Try these fixes:
https://www.techwalla.com/articles/how-to-fix-a...
https://www.thewindowsclub.com/mouse-pointer-st...
(Avoid ad links which intrude into editorial copy, especially avoid Restoro, PC Repair Tool and Reimage ads)
https://winaero.com/fix-mouse-pointer-sticks-on...
https://appuals.com/disable-sticky-corners-edge...
(Avoid ad links which intrude into editorial copy, especially avoid Restoro, PC Repair Tool and Reimage ads)
Report back results for each step so I know what else to suggest.
Feel free to ask back any questions. Based on the results you post back I may have other suggestions if necessary.
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