How to Hide Expandable FAQ Admin Menus

function plt_hide_expandable_faq_menus() {
	//Hide "Expandable FAQ".
	remove_menu_page('expandable-faq-single-menu');
	//Hide "Expandable FAQ → F.A.Q. Manager".
	remove_submenu_page('expandable-faq-single-menu', 'expandable-faq-faq-manager');
	//Hide "Expandable FAQ → Demos".
	remove_submenu_page('expandable-faq-single-menu', 'expandable-faq-demos');
	//Hide "Expandable FAQ → Manual".
	remove_submenu_page('expandable-faq-single-menu', 'expandable-faq-manual');
	//Hide "Expandable FAQ → Settings".
	remove_submenu_page('expandable-faq-single-menu', 'expandable-faq-settings');
	//Hide "Expandable FAQ → Status".
	remove_submenu_page('expandable-faq-single-menu', 'expandable-faq-single-status');
}

add_action('admin_menu', 'plt_hide_expandable_faq_menus', 11);

Where do I put this code?