function plt_hide_support_ticket_menus() {
//Hide "Tickets".
remove_menu_page('sts');
//Hide "Tickets → Tickets".
remove_submenu_page('sts', 'sts');
//Hide "Tickets → New Ticket".
remove_submenu_page('sts', 'sts-new');
//Hide "Tickets → Settings".
remove_submenu_page('sts', 'sts-settings');
}
add_action('admin_menu', 'plt_hide_support_ticket_menus', 11);