@IamjuViel

@Charies_M

Please Learn from this input. You are both pointing out things that do not matter to the question.

@Organizer

What you see is a Bad Transition over the past few years, starting with QB 20132. Open Customer Center, and on the right side, you see Tabs. One of these is Contacts. Here is Primary Contact, for instance.  The info that used to be Customer Contact is now Primary Contact.

For the Variably-labeled field seen in Edit Customer, most of this is Notational, Not Functional. Think of this as an Index card. The Labels you assign in most of these fields is Not the label seen in reporting. The one that starts labeled Mail Email and the CC EMail are Functional, thankfully. You can select a different label, but they are Functionally tied to Send Email transactions and the send queue.

Please see my attachment. This is from QB 2012.