Welcome to the Centrify Express forum.
Centrify Express works in Auto Zone mode, this means that the UNIX identity of AD users and groups is emulated for you by the client. The pre-canned options are:
login -> same as AD login name
UID -> generated with the Centrify or Apple algorithms and based on the user's AD SID
Primary Group -> auto-private (same as UID)
Home -> [platform default] e.g. /home/username for Linux; /export/home/user for Solaris, etc
Shell -> primary shell for the platform
GECOS -> DisplayName in AD
For full Identity manipulation, we recommend that you evaluate Centrify Standard Edition.
https://www.centrify.com/express/linux-unix/reasons-to-upgrade/
R.P