Customize the Dashboard Menu Editor

I found the answer after I typed out the question so I’ll post it at the same time.

The solution is to set the show_in_nav_menus option to false when registering the Custom Post Type.

http://codex.wordpress.org/Function_Reference/register_post_type

show_in_nav_menus (boolean) (optional) Whether post_type is available for selection in navigation menus.
Default: value of
public argument

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