How are users listed within the group’s membership list?
By default, members within a group profile are listed alphabetically by their username. You can click any column to sort alphabetically within that column.
To view the members within a groups profile you will either need to be an administrator of the group or the group must have the Membership List set to “Show: All members can see each other.”
Group Membership Directory Channel
Within a Group Membership Directory channel, the group names are listed alphabetically by last name. You can also click on the ‘Email’ field to list the members alphabetically by last name within the Group Membership Directory channel.