If this setting is enabled then when a user views group members, the LDAP attributes specified in this setting will be shown as additional columns. Add a new item for each additional column that you wish to be added, using the format LdapName;DisplayName
Each entry must have the LDAP name of the attribute followed by a semi colon and then the text that you wish to be displayed as the column header. So for example to add a column showing each member's logon username you could use: sAMAccountName;Username
If this setting is disabled or not configured then only the default columns will be shown.