I have two macs, a 2010 MBP and a 2013 MBA. They run identical software: both use macOS 10.12.6, and Contacts.app 10.0, build 1756.20.
The "General" pane of Contacts.app's Preferences displays differently on the two machines. The MBP shows this:
while the MBA shows this:
Why are the panes different?