Using Navigator.popUntil and route without fixed name

You should add a setting when pushing your route; with a custom name

Navigator.pushReplacement(
  context,
  MaterialPageRoute(
    settings: RouteSettings(name: "Foo"),
    builder: ...,
  ),
);

Then you can use popUntil as you'd do with named routes

Navigator.popUntil(context, ModalRoute.withName("Foo"))

If you do not use named routes or we want to the navigator to First active, you can use

Navigator.of(context).popUntil((route) => route.isFirst)

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