How to Hide WebPlus LiqPay WooCommerce Admin Menus

function plt_hide_webplus_liqpay_woocommerce_menus() {
	//Hide the "WebPlus LiqPay" menu.
	remove_menu_page('admin.php?page=wc-settings&tab=checkout&section=liqpay-webplus');
	//Hide the "WebPlus LiqPay → WebPlus LiqPay" menu.
	remove_submenu_page('admin.php?page=wc-settings&tab=checkout&section=liqpay-webplus', 'admin.php?page=wc-settings&tab=checkout&section=liqpay-webplus');
	//Hide the "WebPlus LiqPay → Pro версия" menu.
	remove_submenu_page('admin.php?page=wc-settings&tab=checkout&section=liqpay-webplus', 'pro-liqpay-webplus-version');
}

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

Where do I put this code?