display a component in button click (using hooks)

I'm trying to display a component in button click, What do I need to change in the syntax?
Anyone understand where the mistake is? The functions works but not as I need to, I have progressed since the previous question here display a different component with each button click

I really want to understand the right and the simple method

Thanks!

App.js

import React, {useState} from 'react';
import './App.css';
import Addroom from './components/Addroom.js'
import HomePage from './components/HomePage.js'

function App() {

  const [flag, setFlag] = useState(false);



  return (
    <div className="App">
     
     <h1>My Smart House</h1>


      <button className="button1" onClick={()=>setFlag(!flag)}>Change Flag</button>
      {flag.toString()}

      <Addroom a={(!flag)}/>
      <HomePage h={(flag)}/>

</div>

  )
}
export default App;

HomePage.js

import React from 'react'

export default function HomePage(props) {
    return (
        <div>
           <h2> HomePage {props.h}</h2>
        </div>
    )
}

Addroom.js

import React from 'react';


export default function Addroom(props) {
    return (
        <div>
           <h2> Addroom {props.a}</h2>
        </div>
    )
}