According to documentation, setting route property noindex to true like the example below it would prevent the page to be included in sitemap:
<Route component={privacyPolicyPage} path="/privacy-policy" noindex="true"/>
For the sake of completeness, here the relevant code for route map:
//app.js
import React from 'react'
import { Root } from 'react-static'
import { Route, Switch, Redirect} from "react-router-dom";
<Switch>
<Route exact path="/p1" component={About} />
...
<Route component={About} path="/about" priority="0.1" />
<Route component={PrivacyPolicy} PrivacyPolicy path="/privacy-policy" noindex="true" />
<Route component={p404} noindex="true" />
</Switch>
Yet, neither it removes the privacy-policy url or even change any priority.
It is my first time with reactjs framework, so it is most likely i miss understood something.
The docs say that this prop is Boolean type, so please try this:
Using
noindex="true"
will pass a string value...