In react-router-dom v6, “Switch” is replaced by routes “Routes”. You need to update the import from
import { Switch, Route } from "react-router-dom";
to
import { Routes ,Route } from 'react-router-dom';
You also need to update the Route declaration from
<Route path="/" component={Home} />
to
<Route path="/welcome" element={<Home/>} />
In react-router-dom, you also do not need to use the exact in the Route declaration.
For more information, you can visit the official documentation:
upgrade to react-router-dom v6