It might be working

frontend/src/index.js

@@ -1,17 +1,14 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
 import { createRoot } from 'react-dom/client';
-import { Provider } from 'react-redux'
 import { Routes ,Route } from 'react-router-dom';
-import { ConnectedRouter } from 'connected-react-router'
+import { BrowserRouter } from "react-router-dom";
+import { Provider } from 'react-redux'
 import configureStore, { history } from './redux-router/configureStore'
-import ReactGA from 'react-ga';
-
 
 import 'semantic-ui-css/semantic.min.css'
-/*
+
 // withTracker
-import withTracker from './withTracker';
+//import withTracker from './withTracker';
 
 // Main
 import MainContainer from "./Main/MainContainer"
@@ -22,26 +19,22 @@ import ListSystemsContainer from "./System/ListSystemsContainer"
 // Call
 import CallPlayerContainer from "./Call/CallPlayerContainer"
 
-import AboutComponent from "./About/AboutComponent"*/
+import AboutComponent from "./About/AboutComponent"
 
-ReactGA.initialize(process.env.REACT_APP_GOOGLE_ANALYTICS);
 
 const store = configureStore(/* provide initial state if any */)
 const container = document.getElementById('root');
 const root = createRoot(container);
 root.render(
   <Provider store={store}>
-    <ConnectedRouter history={history}> { /* place ConnectedRouter under Provider */ }
-      <> { /* your usual react-router v4/v5 routing */ }
+  <BrowserRouter>
         <Routes>
-          {/* 
-          <Route exact path="/" component={withTracker(MainContainer)} />
-          <Route exact path="/systems" component={withTracker(ListSystemsContainer)} />
-          <Route exact path="/system/:shortName" component={withTracker(CallPlayerContainer)} />
-          <Route exact path="/about" component={withTracker(AboutComponent)} />*/}
-          <Route render={() => (<div>Miss</div>)} />
+          <Route exact path="/" element={<MainContainer/>} />
+          <Route exact path="/systems" element={<ListSystemsContainer/>} />
+          <Route exact path="/system/:shortName" element={<CallPlayerContainer/>} />
+          <Route exact path="/about" element={<AboutComponent/>} />
+
         </Routes>
-      </>
-    </ConnectedRouter>
+        </BrowserRouter>
   </Provider>
 )