function plt_hide_dashboard_for_pressbooks_h5p_menus() {
//Hide the "Settings → Dashboard for Pressbooks and H5P" menu.
remove_submenu_page('options-general.php', 'dashboard-for-pressbooks-h5p');
}
add_action('admin_menu', 'plt_hide_dashboard_for_pressbooks_h5p_menus', 11);