Grand Tours are a pain to organise for a very large realm

Presumably if you're going on an intimidation tour you want to visit the vassals who are in factions.

But the planner map UI doesn't give you any indication as to who they are. I've taken to writing them all down beforehand and then trying to find them on the map.

Can we have some sort of toggle in the UI so we can just see faction members on that map?