To View the User Lists to Which a Group Belongs

Open the User / Group Management dialog.
Do one of the following:

Expand the All Groups node and select one of the groups listed under it.

or
Expand the Folder and Projects node, select a folder or project to which a group is assigned, then select the group.
Set Display Type to Member Of.
The user lists to which the group belongs display in the Assigned list (right).