How to Hide the "ProBotDev Chatbot" Admin Menu

function plt_hide_probotdev_customer_support_faq_chatbot_menus() {
	//Hide the "Settings → ProBotDev Chatbot" menu.
	remove_submenu_page('options-general.php', 'pbd-cs-faq-chatbot');
}

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

Where do I put this code?