You can stop syncing your contacts from your Account Settings.
To stop syncing your contacts:
- Tap on your Profile picture in the upper right-hand corner.
- From your Profile page, tap the Gear icon in the upper right-hand corner.
- You’ve reached the Account Settings page:
4. Tap on the Sync Contacts toggle.
5. Tap Yes, I’m sure to confirm you’d like to stop syncing your contacts, or Keep sync on if you’d like to continue.