function plt_hide_better_section_navigation_metaboxes() {
$screen = get_current_screen();
if ( !$screen ) {
return;
}
//Hide the "Sectional Navigation" meta box.
remove_meta_box('bsn_ep_admin_meta_box', $screen->id, 'side');
}
add_action('add_meta_boxes', 'plt_hide_better_section_navigation_metaboxes', 20);