Xamarin Android - Is the scanner automatically enabled?

I'm working on a Xamarin Android application for the TC20 scanner, I've pulled in the Nuget package and added the necessary entries to my AndroidManifest file.  When testing a simple activity, I noticed that the barcode scanner was enabled even though I had not yet added any code to enable to enable the scanner through the BarcodeManager. 

When testing the barcode content was correctly placed in an input field, is the default scanner automatically enabled?  I didn't expect this to work without explicitly enabling the scanner object