The underline sticks together and enters from right to left!

[aliazizi77]

VerificationCode( length: 3, textStyle: TextStyle(fontSize: 20, color: Colors.black), underlineColor: Colors.black, keyboardType: TextInputType.number, underlineUnfocusedColor: Colors.black, onCompleted: (value) { setState(() { _code = value; }); }, onEditing: (value) {}, ),

[awaik]

hmm,
I've copied\pasted your code, everything looks normal.
Can you please provide me with flutter doctor -v results and the full code of your screen?

[aliazizi77]

The appearance of my project is right to left
I checked for right-to-left apps.

If you add the following code to the main.dart file,
and use flutter_localizations package,
you can check better

  localizationsDelegates: [

// AppLocalizations.delegate,
GlobalMaterialLocalizations.delegate,
GlobalWidgetsLocalizations.delegate,
GlobalCupertinoLocalizations.delegate,
],
supportedLocales: [
// const Locale('en', ''),
const Locale('fa', ''),
],