How can i set default answer in Q&A Azure bot

I want change Default Answer in Q&A Maker Azure Framework Bot, but I cant find field that respond this value. I'm reading documentation (but it looks like it uses an older interface), and I'm trying to find this field but with result.

Here's my current configuration screen:

When creating an Azure Web Bot, one of the default Web Chat clients is a fork of microsoft's BotBuilder-Samples project, specifically 49 - QnAMaker All Features

The source code for Dialog/QnAMakerBaseDialog.cs defines the constant DefaultNoAnswer:

public const string DefaultNoAnswer = "No QnAMaker answers found.";

And then uses that value when returning a response from GetQnAResponseOptionsAsync:

protected async override Task<QnADialogResponseOptions> GetQnAResponseOptionsAsync(DialogContext dc)
{
    var noAnswer = (Activity)Activity.CreateMessageActivity();
    noAnswer.Text = DefaultNoAnswer; // <- used right here

    var cardNoMatchResponse = (Activity)MessageFactory.Text(DefaultCardNoMatchResponse);
           

    var responseOptions = new QnADialogResponseOptions
    {
        ActiveLearningCardTitle = DefaultCardTitle,
        CardNoMatchText = DefaultCardNoMatchText,
        NoAnswer = noAnswer,
        CardNoMatchResponse = cardNoMatchResponse,
    };

    return responseOptions;
}

This particular sample repo doesn't appear to leverage the DefaultAnswer configuration key anywhere.

You can opt to include it when available by updating the noAnswer.Text like this:

- noAnswer.Text = DefaultNoAnswer;
+ noAnswer.Text = this._configuration["DefaultAnswer"] ?? DefaultNoAnswer;

You'll also have to pass in the configuration object through the dependency management system. See this commit for a full example.