As a Program Coordinator, you can mark participants' status as available/unavailable depending on their capacity. Marking them unavailable will prevent other participants from sending them a match request and will help you to keep track of who to manually match, if needed.
To do this:
Navigate to the Participants page
Search for the participant and click on their profile
Scroll down to toggle their status to available or unavailable.
You can also choose to notify them or not
If you wish to do this for multiple participants at once, select the availability icon to change their status.
Mentors and Mentees also have the ability to make themselves available or unavailable.