I have the setting "All taskbars show relevant windows" expecting each monitors taskbar to only show what windows are on that mon. All monitors this is true except the main, however the main does not show anything from my side monitors (good as it should), but it doubles up on my one vertical (below the main).

It makes it impossible to use your taskbar because my bottom monitor has a lot of constant running progs I dont touch (just to glance at), which now floods my main monitor taskbar which I need clean utilizing.