But turning this function on does not help. It only changes the start menu icon and does not hide the taskbar of the secondary monitor.
Your first question was on how to hide Start menu not taskbar, yes?
I have 2 monitors and I want to disable the start menu on the secondary monitor (the primary monitor is unaffected), is this possible?
If you wanted to disable the taskbar on secondary monitor, turn it off in Windows personalization>taskbar setting->untick the "Show my taskbar on all displays.

Thank you,
Basj,
Stardock Community Assistant