How do I prevent Whatsapp displaying entries in the contacts app?
Using Samsung S9:

Whatsapp does show in &quot;custom group&quot; list of available contact lists on my phone
Doing that has not effect on the Phone App contact list though (still showing all contacts available on the phone including whatsapp).

so the question remains:
How to define the address book to be used by the phone app?
Note:
I don't want to merge duplicates becasue that comes with a whole host of new issues like intetional duplicates being merged etc..