I finally got around to adding in a filter for the User selection. While doing this I though about the Users and one could do a reverse look-up on a User and see which Cohorts they were in.

User filter

So I made a small change to the tool and added this in. Now you can search for a User and see which Cohorts they have been added to.

Cohorts a User has been added to.

Using the user filter to populate a Cohort.

Finding a User and checking the Cohorts they have been assigned to.