How do I remove Collaboration Manager rights from CA PPM resources?
To make PPM resource a participant instead of collaboration manager:
1) Go to Project > Team Tab > Participants
2) Select User
3) Click "Make Participant" or "Remove"
Please note, in order to demote someone there has to be a Collaboration Manager as you might get error like CLB-01019: You cannot remove collaboration managers. You must first make them participants.