An easy way to create an internal side section where you can insert a list menu

dependencies:
  flutter_inner_drawer: "^0.2.2"

import 'package:flutter_inner_drawer/inner_drawer.dart';
.
.
.

    final GlobalKey<InnerDrawerState> _innerDrawerKey = GlobalKey<InnerDrawerState>();


    @override
    Widget build(BuildContext context)
    {
        return InnerDrawer(
            key: _innerDrawerKey,
            position: InnerDrawerPosition.start, // required
            onTapClose: true, // default false
            swipe: true, // default true
            offset: 0.6, // default 0.4
            colorTransition: Color.red, // default Color.black54
            animationType: InnerDrawerAnimation.linear, // default static
            innerDrawerCallback: (a) => print(a), // return bool
            child: Material(
                child: SafeArea(
                    child: Container(...)
                )
            ),
            //  A Scaffold is generally used but you are free to use other widgets
            // Note: use "automaticallyImplyLeading: false" if you do not personalize "leading" of Bar
            scaffold: Scaffold(
                appBar: AppBar(
                    automaticallyImplyLeading: false
                )
                .
                .
            ) 
            or 
            CupertinoPageScaffold(                
                navigationBar: CupertinoNavigationBar(
                    automaticallyImplyLeading: false
                ),
                .
                .
            ), 
        )
    }
    
    void _open()
    {
       _innerDrawerKey.currentState.open();
    }
    
    void _close()
    {
       _innerDrawerKey.currentState.close();
    }