Can i align tabs in TabBar to the left instead of center?

Question

What i'd like to do is align the tabs to the left. I've looked at this and this but they don't help me. I've also tried including a column so i can use cross axis aligment but that gives me this type mismatch "The argument type 'Column' can't be assigned to the parameter type 'PreferredSizeWidget'." I'm thinking there has to be a simple way, but i'm out of ideas

child: Scaffold(
  appBar: AppBar(
    title: Text(advisoryService.number),
    flexibleSpace: Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[],
    ),
    bottom: TabBar(
      labelPadding: EdgeInsets.only(left: 8, right: 8),
      isScrollable: true,
      tabs: <Widget>[
        Tab(
          text: 'General',
        ),
        Tab(
          text: 'Financial',
        ),
        Tab(
          text: 'Experts & Participants',
        ),
      ],
    ),
  ),
  body: TabBarView(

Answer 1

Edit: I have update full code and working demo
You can use Alignment.centerLeft
and control full TarBar size with Container and set to relative screen width

    appBar: AppBar(
        title: Text(widget.title),
        bottom: PreferredSize(
          preferredSize: const Size.fromHeight(20.0),
          child: Align(
            alignment: Alignment.centerLeft,
            child: Container(
              width: MediaQuery.of(context).size.width / 2,
              child: TabBar(
                isScrollable: true,
                controller: _tabController,
                tabs: [
                  Tab(text: 'Tab 1'),
                  Tab(text: 'Tab 2'),
                  Tab(text: 'Tab 3'),
                  Tab(text: 'Tab 4'),
                  Tab(text: 'Tab 5'),
                ],
              ),
            ),
          ),
        ),
      ),

Working demo

full code

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final appTitle = 'Tabs Demo';
    return MaterialApp(
      title: appTitle,
      home: MyHomePage(title: appTitle),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;

  const MyHomePage({Key key, this.title}) : super(key: key);

  @override
  State<StatefulWidget> createState() {
    return _MyHomePageState();
  }
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  int _tabIndex = 0;

  TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(vsync: this, length: 5);
  }

  void _toggleTab() {
    _tabIndex = _tabController.index + 1;
    _tabController.animateTo(_tabIndex);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      bottomNavigationBar: BottomAppBar(
        notchMargin: 20,
        child: new Row(
          // mainAxisSize: MainAxisSize.max,
          mainAxisAlignment: MainAxisAlignment.end,
          children: <Widget>[
            InkWell(
              onTap: () {
                _toggleTab();
              },
              child: Text(
                'Next >',
                style: TextStyle(fontSize: 20, color: Colors.red),
              ),
            )
          ],
        ),
      ),
      appBar: AppBar(
        title: Text(widget.title),
        bottom: PreferredSize(
          preferredSize: const Size.fromHeight(20.0),
          child: Align(
            alignment: Alignment.centerLeft,
            child: Container(
              width: MediaQuery.of(context).size.width / 2,
              child: TabBar(
                isScrollable: true,
                controller: _tabController,
                tabs: [
                  Tab(text: 'Tab 1'),
                  Tab(text: 'Tab 2'),
                  Tab(text: 'Tab 3'),
                  Tab(text: 'Tab 4'),
                  Tab(text: 'Tab 5'),
                ],
              ),
            ),
          ),
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: [
          Card(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                ListTile(
                  leading: Icon(Icons.album),
                  title: Text('Hello 1'),
                  subtitle: Text('Click on Next Button to go to Tab 2.'),
                ),
              ],
            ),
          ),
          Card(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                ListTile(
                  leading: Icon(Icons.album),
                  title: Text('Hello 2'),
                  subtitle: Text('Click on Next Button to go to Tab 3'),
                ),
              ],
            ),
          ),
          Card(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                ListTile(
                  leading: Icon(Icons.album),
                  title: Text('Hello 3'),
                  subtitle: Text('The End'),
                ),
              ],
            ),
          ),
          Card(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                ListTile(
                  leading: Icon(Icons.album),
                  title: Text('Hello 4'),
                  subtitle: Text('The End'),
                ),
              ],
            ),
          ),
          Card(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                ListTile(
                  leading: Icon(Icons.album),
                  title: Text('Hello 5'),
                  subtitle: Text('The End'),
                ),
              ],
            ),
          ),
        ],
      ),
    ));
  }
}