DART

debug banner flutter

// Add debugShowCheckedModeBanner: false to your Material
return new MaterialApp(
	debugShowCheckedModeBanner: false,
    theme: new ThemeData(
      primarySwatch: Colors.green,
    ),
    //...
);

disable debug banner flutter

MaterialApp(
  debugShowCheckedModeBanner: false,
)

flutter remove debug banner

MaterialApp(
 debugShowCheckedModeBanner: false,
)

remove debug banner flutter

MaterialApp(
  debugShowCheckedModeBanner: false,
)

flutter disable debug banner

add debugShowCheckModeBanner:false in MaterialApp()