src/theme/NotFound/index.js

import React from 'react';
import { translate } from '@docusaurus/Translate';
import { PageMetadata } from '@docusaurus/theme-common';
import Layout from '@theme/Layout';
import NotFoundContent from '@theme/NotFound/Content';

export default function NotFound() {
    return (
        <>
            <PageMetadata
                title={translate({
                    id: 'theme.NotFound.title',
                    message: 'Page Not Found',
                })}
            ><meta name="robots" content="noindex, follow" /></PageMetadata>
            <Layout>
                <NotFoundContent />
            </Layout>
        </>
    );
}