> Swap between the screens by the screen depth gadget or the command-m
> shortcut to get the mouse pointer to the wanted screen.

Unless misread, this sounds like MorphOS 3.16 now behaves more like mainstream operating systems:

"Intuition
Reimplemented handling of monitors with multiple outputs, enabling mouse movement between displays"
https://www.morphos-team.net/releasenotes/3.16