How to Hide Responsive Menu Admin Menus

function plt_hide_responsive_menu_menus() {
	//Hide "Responsive Menu".
	remove_menu_page('edit.php?post_type=rmp_menu');
	//Hide "Responsive Menu → Menus".
	remove_submenu_page('edit.php?post_type=rmp_menu', 'edit.php?post_type=rmp_menu');
	//Hide "Responsive Menu → Settings".
	remove_submenu_page('edit.php?post_type=rmp_menu', 'settings');
	//Hide "Responsive Menu → Themes".
	remove_submenu_page('edit.php?post_type=rmp_menu', 'themes');
	//Hide "Responsive Menu → Roadmap".
	remove_submenu_page('edit.php?post_type=rmp_menu', 'roadmap');
}

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

Where do I put this code?