You can quickly toggle between Totalview contacts, Totalview plus local contacts and favourites by clicking on the title in the top:
The advanced filtering system in the Totalview client is also available in the iPhone application. You can access it in the Contacts view via tapping on the filter icon. There you can choose to filter the contact list by type of contact (i.e. Totalview contact, personal contact or favourite), or by custom field (e.g. capability, division, title, etc.).
In order to quickly turn the the advanced filter on or off, you can use the toggle on the right side.
You can search for any person in your contacts by typing a phrase into the search field at the top. Note that searching will be carried out in the currently filtered group only. In order to search in all contacts, you need to disable your filters first.