function plt_hide_wp_featherlight_metaboxes() {
$screen = get_current_screen();
if ( !$screen ) {
return;
}
//Hide the "WP Featherlight" meta box.
remove_meta_box('wp_featherlight_options', $screen->id, 'side');
}
add_action('add_meta_boxes', 'plt_hide_wp_featherlight_metaboxes', 20);