Open Membership

If you click "Edit" next to a group type you will see that "Open Membership" is enabled. Open Membership means that employees can self-assign themselves to groups within this group type from their settings page.

For example, you have a "Team" group type that contains Team A, Team, B, Team C. When an employee logs in they can self-select which team they belong to from their settings page.

While Open Membership can be enabled, the permission "Group Memberships: Edit - Can Join Open Groups" must be enabled as well before users can join groups without being added by an admin or manager.