appBarBackground property
Background theme color for the AppBar.
This theme color cannot be controlled separately with Flutter's standard ThemeData.from a ColorScheme. FlexColorScheme enables you to specify an app bar theme color that is independent of the primary color in light theme and in dark mode of the dark theme's dark surface color.
If no color is given it defaults to the Flutter standard color scheme based light and dark app bar theme colors.
Implementation
final Color? appBarBackground;