automaticallyImplyLeading property
Provides Control of the AppBar's leading widget.
When set to true, the framework will automatically add a leading widget to the app bar or navigation bar. The widget will be either a BackButton (if the Navigator has more than one page in the stack) or a drawer
When set to false, no leading widget will be added automatically. This is useful when you want to provide your own custom leading widget.
Implementation
final bool automaticallyImplyLeading;