Right now, project members with "collaborator" level are only listed as "collaborator" in the Members popup, without showing the branches that they have access to. The only way to see this value seems to be to edit the membership, which seems suboptimal, and is only visible for members with "admin" or "owner" access level.

Maybe the accessible branches can be expanded against the actual branches in the repo, and listed below "collaborator" in the Members popup?

For example: https://src.fedoraproject.org/rpms/syncthing
I have added eclipseo with "collaborator" access, with epel8* setting for branches. Ideally, the Members popup would show "collaborator\n(epel8, epel8-playground)" for them.