This can be done with the filter field "Limit contact information to Organizational Unit(s)" in the "List of persons" element. If a value is set there, only the contact information of the corresponding organizational unit will be shown. The site admin can globally set a default for this field, so even if the field is not set in the element, a filter will still be applied. You can override this default by checking "If above limit is empty: Contact information from all Organizational Units are shown".

If the above options do not work, it is possible that the cause of the error is in the GF-GUI (IDM). Possibly blocks with a "crossed out eye" are hidden there, or a filled in free text field overwrites the database connection.

If you are unsure, ask a site admin of your website.