You can create a new component AppRouter.jsx:

import {routes} from "@/routes.js";

    export default function AppRouter() {
      return (
        <Routes>
          {routes.map(route => <Route path={route.path} element={route.component} />)}
        <Routes/>
      )
    }

Then create a file containing routes routes.js:

import A from "@/components/A";
import B from "@/components/B";
import C from "@/components/C";
import Login from "@/components/Login";

export const routes = [
  {
    path: "/a",
    component: <A />
  },  
  {
    path: "/b",
    component: <B />
  },
  {
    path: "/c",
    component: <C />
  },
  {
   path: "/",
   component: <Login />
  },
]

Then use it in your App component:

function App() {

  return (
   <MainLayout>
     <AppRouter/>
  </MainLayout> )}

If you need to create new routes in the future, go to routes.js and add them there.