How can I make a URL non-modifiable on Angular?

Ok, so there's this project i'm working on where we have a particular page (lets say localhost:XXXX/notification-page) and we're looking for it to be the only URL where you can get there, whenever we change the url it sends you to the same exact page (the notification-page one).

I'm pretty new to Angular (been working with it for about three days from scratch), so... How could I fix that?

So far, my app-routing.module.ts document looks like this:

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

const routes: Routes = [];

@NgModule({
imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]
})
export class AppRoutingModule { }

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