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To modify the AppBar of a Thingsboard Flutter app, follow these steps:

1. Open the dart file of the page where you want to modify the AppBar.
2. Locate the AppBar widget code in the build method.
3. To change the title of the AppBar, modify the "title" property of the AppBar widget.
4. To change the color of the AppBar, modify the "backgroundColor" property of the AppBar widget.
5. To add buttons to the AppBar, use the "actions" property of the AppBar widget. Example:

import 'package:flutter/material.dart';

class MyPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My Title'),
        backgroundColor: Colors.blue,
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.more_vert),
            onPressed: () {},
          ),
        ],
      ),
      body: Container(),
    );
  }
}