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To eliminate the debug banner in Flutter, add the following line of code to the MaterialApp widget or the CupertinoApp widget, depending on which one you are using:

debugShowCheckedModeBanner: false,

For example:

void main() {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MyWidget(),
    ),
  );
}

This will remove the "debug" banner from the top right corner of your app's screen.