Has anyone else tried their clustering tool? Here's one using a group I made of matches of people with ancestors born in Finland and the extend cluster option(Ancestry DNA)

I didn't get the extend cluster option at first hence this reply at GA facebook group .

It pulls in the shared matches from you and the people in the group(s) and adds them to the list. This means that these people are in your DNA match list AND in the list of DNA matches of people in your group.