placeholderBehavior property

Manages the visibility of the placeholder widget.

Allowing it to either hide when a message is added or or stay visible, positioned above all messages.

Defaults to AssistPlaceholderBehavior.scrollWithMessage.

@override
Widget build(BuildContext context) {
  return SfAIAssistView(
    placeholderBehavior: AssistPlaceholderBehavior.hide,
    placeholderBuilder: (BuildContext context) {
      return Text('No messages yet');
    },
  );
}