Hi v_kyr, thanks for your response. I recall disconnecting my M1 from my dock and still seeing the same problem and possibly gave me the false impression that its not DisplayLink related (even undocked, the software is still running). BTW, other affinity apps work (Publisher and Photo).
Also, I am indeed using a Dell dock and which guided me towards using DisplayLink. When I didnt have DisplayLink, only 2 of 3 monitors fired up.
I am wondering though whether I moved the window to some x,y coordinate that is blowing up DisplayLink and/or Designer. When I "lost" my window initially, DisplayLink was doing something funky where I couldn't drag a window to my retina screen, and that's when I was forcing the issue in resizing and moving things around until I moved it off the retina screen but not quite into the other monitors.
Do we know if there's a config I can delete?
Thanks for your response!