How to Hide Smart WooCommerce Search Admin Menus

function plt_hide_smart_woocommerce_search_menus() {
	//Hide "Smart Search".
	remove_menu_page('smart-search');
	//Hide "Smart Search → Widgets".
	remove_submenu_page('smart-search', 'smart-search');
	//Hide "Smart Search → Add New".
	remove_submenu_page('smart-search', 'smart-search-custom-new');
	//Hide "Smart Search → Index Status".
	remove_submenu_page('smart-search', 'smart-search-index-status');
	//Hide "Smart Search → Synonyms".
	remove_submenu_page('smart-search', 'smart-search-synonyms');
	//Hide "Smart Search → Stop Words".
	remove_submenu_page('smart-search', 'smart-search-stop-words');
	//Hide "Smart Search → Start Trialāž¤".
	remove_submenu_page('smart-search', 'smart-search-pro-trial');
	//Hide "Smart Search → Upgrade".
	remove_submenu_page('smart-search', 'smart-search-pricing');
}

add_action('admin_menu', 'plt_hide_smart_woocommerce_search_menus', 1000000000);

Where do I put this code?