import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Text fields')),
        body: SingleChildScrollView(
          padding: const EdgeInsets.symmetric(horizontal: 20),
          child: Column(
            children: [
              for (var i = 0; i < 20; i++)
                TextFormField(
                  key: ValueKey(i),
                  decoration: InputDecoration(hintText: 'Field $i'),
                ),
            ],
          ),
        ),
      ),
    );
  }
}