Require New Users to Belong to at Least One Group
By default, users do not need to belong to any groups. If, as a Portal Administrator or a user with permission to add other users, you would like to require that new users belong to at least one group, click the drop-down menu in the top-left corner of the page and select the Portal Administration link (Fig. 1).
From the Portal Administration page, select the Portal Settings card (Fig. 2).
From the Portal Settings page, select the Advanced tab (Fig. 3).