How to Hide Contact Form by BestWebSoft Admin Menus

function plt_hide_contact_form_plugin_menus() {
	//Hide "Contact Form".
	remove_menu_page('contact_form.php');
	//Hide "Contact Form → Settings".
	remove_submenu_page('contact_form.php', 'contact_form.php');
	//Hide "Contact Form → BWS Panel".
	remove_submenu_page('contact_form.php', 'cntctfrm-bws-panel');
	//Hide "Contact Form → Upgrade to Pro".
	remove_submenu_page('contact_form.php', 'https://bestwebsoft.com/products/wordpress/plugins/contact-form/?k=697c5e74f39779ce77850e11dbe21962&pn=77&v=4.2.9&wp_v=6.5.2');
}

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

Where do I put this code?