title: how to get rid of space between appbar & tabbar in flutter?
body: <p>I'm trying to do it but I do not know how to do it</p>
  <p><img src="https://i.stack.imgur.com/orjws.jpg" alt="enter image description here" /></p>
  <p>I wanna get rid of green box space.
  I've trying with PreferedSize widget but it doesn't work my code is ...</p>
  <pre><code>  @override
    Widget build(BuildContext context) {
      return SafeArea(
        child: PreferredSize(
          preferredSize: Size.fromHeight(SizeConfig.heightMultiplier * 6.2),
  // it's pretty narrow size but doesn't work in this screen but others
          child: Scaffold(
            appBar: AppBar(
              centerTitle: true,
              title: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: &lt;Widget&gt;[
                  Text(
                    'hello',
                    style: TextStyle(fontWeight: FontWeight.bold),
                  ),
                  Text(
                    'world',
                  ),
                  Text(
                    '!',
                    style: TextStyle(fontWeight: FontWeight.bold),
                  ),
                ],
              ),
              actions: &lt;Widget&gt;[
                Icon(
                  Icons.add,
                  color: Colors.transparent,
                ),
              ],
              backgroundColor: Theme.of(context).primaryColor,
              bottom: TabBar(
                controller: tabController,
                indicatorColor: Colors.white,
                tabs: myTabs,
              ),
            ),
  ...
  </code></pre>
  <p>I need your help ☑</p>