How do I enter contacts so that they are separate from my Contacts app?

If you want to keep your Contacts Journal data separate from your Contacts app, you can create "Private Contacts". Private Contacts are saved only inside Contacts Journal, and not synced with your Contacts app. 

Note that you can only add "Private Contacts" to a Private Group. Also, on iOS, you still need to give permission to access your Contacts data, even though we don't save "Private Contacts" into the Contacts app. 

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