How do I control what state groups are columns in a Taskboard?

Hi

I would like to create a new state group Implemented in between of In Progress and Closed

for epics and story but not for Tasks

But "unfortunately" the state group are system wide and not per Work Item Type.

And so the new state group appears on the Taskboard, also there is no execution item state belonging to this new group.

I there a way to "hide" this new state group from the taskboard, or remove it from the execution items workflows?

Thanks you

erwin