Centos 7: Remove Gnome from GDM options

[Frank Cox <theatre@xxxxxxxxxxxxxxxxxxx>]

When you click on the gear icon on the GDM login screen, it provides a list of the available desktop environments so you can pick between them.

Since I exclusively use Mate on this computer, how can I remove the other options from that menu?  Earlier today when I logged in the machine decided on its own that what I really wanted was Gnome Classic, so I had to log out to change it back to Mate, then log in again.

I would like to tell it to use Mate exclusively, with no other options to select by mistake.

-- 
MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com
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