I've been trying to find a way to hide/deactivate the Parent Drop Down Menu from the Categories submenu. I also able to hide the "Slug" option through this function here:

// Admin - Global Terms Enabled
function disable_global_terms($enablefalse) {
   return 1;
}
add_filter( 'global_terms_enabled', 'disable_global_terms' );

Is there a way to do the same for the Parent Drop Down menu w/o deleting that code from the main WP files so I would have to do this each time w/ each update?

Thanks! Roc.