How to disable_user_list on GDM Login Screen in RHEL7 ?

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Issue

How to disable "user list" on GDM login screen, so that the user account must be entered prior to authenticating with a password ?
GDM shows all users on login screen. Is there any way to disable it ?
How to remove username list from Login Screen in RHEL7 ?

Environment

Red Hat Enterprise Linux 7
gdm-3.8.4-27.el7.x86_64

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