confirm dialog et button back

Good evening, everyone. I need your help. I am currently developing an app using FlutterFlow, but when I add a "confirm dialog" and set a "close dialog" action, it not only dismisses the dialog but also navigates back to the previous page; however, I want the dialog to simply disappear when the user clicks "Cancel."

My second issue is that I cannot seem to configure the Android back button so that pressing it on the app's home screen exits the application.

Thanks in advance for your answers.