How to Change Default Position of Listview Item display on top of AppBar in Flutter

You can wrap the ListView inside a Column and place the AppBar widget above the ListView.

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Column(
          children: [
            AppBar(
              title: Text('Your Title'),
              elevation:0,
             
            ),
            Expanded(
              child: ListView(
                children: [
                  Container(
                    height: MediaQuery.of(context).size.height,
                    width: MediaQuery.of(context).size.width,
                    decoration: const BoxDecoration(
                      image: DecorationImage(
                        image: NetworkImage(
                          'https://th.bing.com/th/id/OIP.GPgOs_sd9nF8fsKDOJe9dQHaEo?w=278&h=180&c=7&r=0&o=5&pid=1.7',
                        ),
                        fit: BoxFit.fill,
                        colorFilter: ColorFilter.mode(
                          Colors.black45,
                          BlendMode.difference,
                        ),
                      ),
                    ),
                    child: Align(
                      alignment: Alignment.centerLeft,
                      child: RichText(
                        text: const TextSpan(
                          style: TextStyle(
                            fontFamily: "Inter",
                            fontSize: 40,
                            fontWeight: FontWeight.bold,
                            color: Colors.white,
                          ),
                          children: [
                            WidgetSpan(
                              child: Padding(
                                padding: EdgeInsets.only(left: 60),
                                child: Text(
                                  "Where Dreams Take Flight:",
                                  style: TextStyle(
                                    fontSize: 50,
                                    fontWeight: FontWeight.bold,
                                  ),
                                ),
                              ),
                            ),
                            WidgetSpan(
                              child: Padding(
                                padding: EdgeInsets.only(left: 50),
                                child: Text(
                                  "Explore the globe with Travel Eyes",
                                  style: TextStyle(
                                    fontSize: 50,
                                    fontWeight: FontWeight.bold,
                                  ),
                                ),
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                  Container(
                    color: Colors.orange,
                    height: 100,
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Result: