You can view contacts across all lists, create and edit contacts and view contact reports. You can also browse for individual contacts by email address or mobile number.
Contacts are subscribed to a list by email address or mobile number and can be assigned to more than one list - this is referred to as 'mapping' a contact. If the contact unsubscribes from one list, they stay mapped to other lists they've subscribed to. Using the action buttons in the Action Bar, you can create, edit or delete contacts. You can also access Advanced options and Reports.