Flutter jitsi meet sdk changing ui

Question

hello iam using Jitsi meet SDK in my flutter app and iam self hosting meetings as below links

https://meetrix.io/blog/webrtc/jitsi/jitsi_meet_front_end_customization.html

https://jitsi.github.io/handbook/docs/devops-guide/devops-guide-quickstart/

_joinMeeting() async {
    try {
      FeatureFlag featureFlag = FeatureFlag();
      featureFlag.serverURLChangeEnabled= true; 
      
      var options = JitsiMeetingOptions()
        ..room = "myroom" 
        ..serverURL = "https://myhosting.com"
        ..userDisplayName = "MyName"
        ..userEmail = "myemail@email.com"
        ..featureFlag = featureFlag;

      await JitsiMeet.joinMeeting(options);
    } catch (error) {
      debugPrint("error: $error");
    }
  }

anyone have an idea of how to customize meeting interface