To View the Members of a User List

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

Expand the All User Lists node and select one of the user lists listed under it.

or
Expand the Folder and Projects node, select a folder or project to which a user list is assigned, then select the user list.
Set Display Type to Members.
The users, groups, and/or user lists that belong to the selected user list display in the Assigned list (right).