Issue in native app while trying to exit the app

[rite2bala]

Issue in the user experience while using a native app: Description: Screen goes back through all the previous screens but doesn't exit the app

Steps to reproduce the issue:

1. open the native app
2. change the settings as required
3. scan a few products - at least 3
4. try to click back to exit the app
5. click multiple times and you would see that the app goes through all the previous pages and does not exit the app as other apps normally would exit

https://user-images.githubusercontent.com/44022980/143530132-00178731-1e9f-4271-90e8-9f818c85e6f1.mp4

expected behaviour : When back button is clicked , the app must not go back to the previous pages like in a browser -- the app must exit/ close at the right time.

[salboaie]

It requires a bigger investment in the Android version, we propose to postpone for next year as there is no quick fix we can do