phone numbers no longer format in contacts
After upgrading to Mavericks I have noticed that the phone numbers in "Contacts" no longer format.
In Mountain Lion, if I typed a 10 digit number, it would format to : (xxx) nnn-nnnn.
I thought that was a configuration option previously, but I cannot find anything which appears to relate.
I have checked every panel in System Preferences and in Contact's Preferences.
Is this just another Apple Enhancement where they eliminate features?
iMac, OS X Mavericks (10.9), iMac Core i7 2.93GHz 4GB