php – Remove Metabox from the WordPress Menu Editor Page?

I'm trying to remove meta-boxes added to the WordPress Menu Editor page from a topic, but I can not figure out how to do that. I found this answer, but I have to do something wrong, because it does not work.

I would like to remove the following:

Enter image description here

My code:

add_action( 'do_meta_boxes', 'blm_remove_plugin_metaboxes' );

function blm_remove_plugin_metaboxes() {
    remove_meta_box('_menu_icon', 'nav-menus', 'side');
}

I tried the following for the ID, but none worked:

  • _menu_icon
  • menu_icon
  • add-_menu_icon
  • add_menu_icon

Do I miss something?