Please Help. Scan area full screen

Hi.

I am creating a barcode reader using Flutter. And I would like to scan the full screen barcode, not just the red line I installed lib using the

pubspac.yaml
dependencies:
   barcode_scan: ^ 1.0.0

So I can't change the lib .java files The only files I can change are as follows.

1 - I need you to read the whole bar Print: https://ibb.co/2PZqGJh

2 - I can only edit these files Print: https://ibb.co/4RzhSWg

3 - In this OnCreate class I can only change this information Print: https://ibb.co/nRPPZrv

I'm trying to correct this problem for days and I can't, has anyone been through this?

dm77 / barcodescanner