I saw the 「Windows 10 Known Issues: Start menu opens briefly on the Primary monitor before moving to the DisplayFusion taskbar when monitors have differing scaling settings or if monitor splitting is enabled. Not fixable」

I have the same start menu issue and my monitors have same scaling settings & monitor splitting is disabled.

(Or did I misunderstand "monitor splitting"? did "two physics monitor in extend mode" cunt as monitor splitting enabled as well?)

Both "clicking the start button" & "using the Windows key" result in the same issue.