How to Hide WP Fast Total Search - The Power of Indexed Search Admin Menus

function plt_hide_fulltext_search_menus() {
	//Hide "Fast Total Search".
	remove_menu_page('wpfts-options');
	//Hide "Fast Total Search → Main Configuration".
	remove_submenu_page('wpfts-options', 'wpfts-options');
	//Hide "Fast Total Search → Indexing Engine".
	remove_submenu_page('wpfts-options', 'wpfts-options-indexing-engine');
	//Hide "Fast Total Search → Search & Output".
	remove_submenu_page('wpfts-options', 'wpfts-options-search-relevance');
	//Hide "Fast Total Search → Sandbox Area".
	remove_submenu_page('wpfts-options', 'wpfts-options-sandbox-area');
	//Hide "Fast Total Search → Analytics".
	remove_submenu_page('wpfts-options', 'wpfts-options-analytics');
	//Hide "Fast Total Search → Support & Docs".
	remove_submenu_page('wpfts-options', 'wpfts-options-support');
	//Hide "Fast Total Search → Partnership".
	remove_submenu_page('wpfts-options', 'wpfts-options-ps');
}

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