Hi,
A video is worth 60,000 words per second: https://youtu.be/4P_aanE0MAM

This is after a straight upgrade to W11 from Windows 10. On Windows 10 tis was working as expected, this issue only occured after the upgrade.

This is on the paid-for & licensed client of DF9.9 at a resolution of 5440x1440.

I have split my monitors up as follows:

This occurs both when I have multi-monitor taskbars enabled and disabled.

Anything I can do to fix this? Whilst still keeping my monitor split into 3?

I have installed Stardock's Start11 to avoid this problem. The windows taskbar is centered and after completely booted up I have to restart explorer.exe and then everything works like it should (touching Winkey start menu pops up in the center).
I have to restart explorer.exe every time I make a change in Displayfusion.
Maybe my experience gives a clue.

Part of this issue still persists in DF 10.0, with triple-wide surround setup (1.1 = far left, 1.2 = centre, 1.3 = far right)
The start menu is properly left-aligned in the centre monitor (1.2) initially when opened with the win key, but as soon as I type anything, Windows seems to replace this start panel with a search window and moves it to the far left of the leftmost monitor (1.1).

If this list carries over to Windows 11, I'd suggest updating that post with "Windows 11/10/[...] Known Issues". I suppose I should have clarified - I am also running Win11.