Co managing profiles

Depends.
If someone is a CLOSE family member to the profile and the profile is connected, they can boot others.
Someone likely knows the official language and procedure.

The first incarnation of a profile (the earlier created/added to Geni) is typically the MAIN/PRIMARY manager-- the one in BOLD TYPE. In order for that to change, it has to be given over by the primary as far as my experience has been.

Thanks Cynthia. "Given over" - does this mean the primary receives a request to become non primary or that it can happen as a result of a merge where the incoming co manager is seen by geni as being a closer relative to the profile?

I have only seen it when I myself add a manager and it gives me the option of making the added manager the primary if I AM the primary already

When profiles are merged, the OLDEST profile's manager will typically be given the primary/bold type