In Qwil Messenger, contact lists are curated and defined specifically for you and are and controlled by the organisation that invited you. Your address book on Qwil is not harvested from your device, or from your personal contact list, but created and managed by your organisation.
Your contacts are determined by which users share a contact book with you. Usually, your administrator will place you and the clients that you cover in contact books so you will be able to see and chat with each other. However, as a staff user, you will also be able to chat with any other staff user in your organisation, by searching the directory.
In order to segregate your contacts so you can see them but they cannot see each other you will belong to one or many contact books.
If you do not belong to any contact book do not worry, you can still chat to any of your colleagues.