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 IconButton (if a drawer is present in the scaffold).
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;