Semi Transparent Overlay in Flutter app, installed in a physical android device in Debug Mode

In my flutter project (latest version), I use a physical android device for development. But in my phone, in the flutter debug app, a semi transparent black overlay is always showing... I tried to run a new project & there also was an overlay.. I don't know if it is the issue with my flutter sdk or my device.

My Code so far

//main.dart
void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Home(),
    );
  }
}

Other widgets

//home.main.dart
class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.blue,
        title: Text("SHKSC", style: TextStyle(color: Colors.indigoAccent[50])),
        iconTheme: IconThemeData(color: Colors.blue, opacity: 0.7),
      ),
      body: HomeBody(), /* Incoming from home.body */
    );
  }
}

The image of the running app on my physical device in Scrcpy.. ImageLink