How to Hide ARETK CREA Admin Menus

function plt_hide_aretk_crea_menus() {
	//Hide "Real Estate".
	remove_menu_page('listings_settings');
	//Hide "Real Estate → Listings".
	remove_submenu_page('listings_settings', 'listings_settings');
	//Hide "Real Estate → Showcases".
	remove_submenu_page('listings_settings', 'showcase_settings');
	//Hide "Real Estate → Leads".
	remove_submenu_page('listings_settings', 'leads_settings');
	//Hide "Real Estate → Datafeed Subscription".
	remove_submenu_page('listings_settings', 'crea-plugin');
	//Hide "Real Estate → Plugin Settings".
	remove_submenu_page('listings_settings', 'plugin_settings');
	//Hide "Real Estate → Support".
	remove_submenu_page('listings_settings', 'support_settings');
}

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

Where do I put this code?