www_site/apps/cms/src/app/(payload)/layout.tsx

import config from "@payload-config";
import { RootLayout } from "@payloadcms/next/layouts";
import "@payloadcms/next/css";
import { serverFunction } from "./serverFunction";

const configPromise = Promise.resolve(config as any);
const importMap = {} as any;

export default function PayloadLayout({ children }: { children: React.ReactNode }) {
  return RootLayout({ config: configPromise, importMap, serverFunction, children });
}