TC51 Zebra device - Enable Bar code Preview - in Xamarin & EMDK

How can i enable bar code preview in TC51 Zebra device.

Screenshot_20180711-150901.png

I would like to enable this view in my Xamarin + EMDK library. I am using the below configuration in my application.

var config = _scanner.GetConfig();
  config.SkipOnUnsupported = ScannerConfig.SkipOnUnSupported.None;
  config.ScanParams.DecodeLEDFeedback = true;
  config.ReaderParams.ReaderSpecific.ImagerSpecific.PicklistEx =
  ScannerConfig.PicklistEx.Hardware;
  config.DecoderParams.Code39.Enabled = true;
  config.DecoderParams.Code128.Enabled = true;
  _scanner.SetConfig(config);