ScaleTransition looks like as it was sliding from right to left

main.dart

import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool _active = false;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: darkBlue,
      ),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: SwitchingWidget(active: _active),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: _toggle,
          child: const Icon(Icons.check)
        ),
      ),
    );
  }

  void _toggle() {
    setState(() {
      _active = !_active;
    });
  }
}

class SwitchingWidget extends StatefulWidget {
  const SwitchingWidget({super.key, this.active = false});

  final bool active;

  @override
  State<SwitchingWidget> createState() => _SwitchingWidgetState();
}

class _SwitchingWidgetState extends State<SwitchingWidget> {
  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.red,
      child: AnimatedSwitcher(
        duration: const Duration(milliseconds: 200),
        transitionBuilder: (child, animation) {
          return ScaleTransition(scale: animation, child: child);
        },
        child: widget.active
          ? _buildLeftAlignedListTile()
          : _buildRightAlignedListTile(),
      ),
    );
  }
  
  Widget _buildLeftAlignedListTile() {
    return const ListTile(
      key: ValueKey(1),
      leading: SizedBox(
        width: 20,
        height: 20,
        child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white),
      ),
      title: Text(
        'Left aligned',
        style: TextStyle(color: Colors.white),
      ),
    );
  }
  
  Widget _buildRightAlignedListTile() {
    return const ListTile(
      key: ValueKey(2),
      title: Text(
        'Right aligned',
        textAlign: TextAlign.right,
        style: TextStyle(color: Colors.white),
      ),
    );
  }
}