How to Hide WH4U Domains Admin Menus

function plt_hide_wh4u_domains_menus() {
	//Hide "Domains".
	remove_menu_page('wh4u-domains');
	//Hide "Domains → Dashboard".
	remove_submenu_page('wh4u-domains', 'wh4u-domains');
	//Hide "Domains → Search".
	remove_submenu_page('wh4u-domains', 'wh4u-domains-search');
	//Hide "Domains → Register".
	remove_submenu_page('wh4u-domains', 'wh4u-domains-register');
	//Hide "Domains → Transfer".
	remove_submenu_page('wh4u-domains', 'wh4u-domains-transfer');
	//Hide "Domains → Pricing".
	remove_submenu_page('wh4u-domains', 'wh4u-domains-pricing');
	//Hide "Domains → History".
	remove_submenu_page('wh4u-domains', 'wh4u-domains-history');
	//Hide "Domains → Queue".
	remove_submenu_page('wh4u-domains', 'wh4u-domains-queue');
	//Hide "Domains → Public Orders".
	remove_submenu_page('wh4u-domains', 'wh4u-domains-public-orders');
	//Hide "Domains → Settings".
	remove_submenu_page('wh4u-domains', 'wh4u-domains-settings');
}

add_action('admin_menu', 'plt_hide_wh4u_domains_menus', 11);

Where do I put this code?