How to Hide WP Helper Premium Admin Menus

function plt_hide_wp_helper_lite_menus() {
	//Hide "WP Helper Premium".
	remove_menu_page('mb-wphelper');
	//Hide "WP Helper Premium → Kênh liên hệ".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-contact');
	//Hide "WP Helper Premium → Header & Footer".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-code');
	//Hide "WP Helper Premium → Cấu hình SMTP".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-smtp');
	//Hide "WP Helper Premium → Bảo mật".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-security');
	//Hide "WP Helper Premium → Tiện ích mở rộng".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-extention');
	//Hide "WP Helper Premium → Nút mua hàng (CTA)".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-woocommerce-cta');
	//Hide "WP Helper Premium → Liên kết với sàn TMDT".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-woocommerce-ecommerce');
	//Hide "WP Helper Premium → Mẫu thông tin thanh toán".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-woocommerce-payment');
	//Hide "WP Helper Premium → Thanh toán bằng ví điện tử".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-woocommerce-wallet');
	//Hide "WP Helper Premium → Tùy chỉnh cửa hàng nâng cao".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-woocommerce-advance');
	//Hide "WP Helper Premium → Bảo trì".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-maintenance');
	//Hide "WP Helper Premium → Pop-up".
	remove_submenu_page('mb-wphelper', 'mb-wphelper-pop-up');
}

add_action('admin_menu', 'plt_hide_wp_helper_lite_menus', 11);
Where do I put this code?