useSafeArea property
True if a SafeArea should be inserted o keep the sheet away from system intrusions on the sides other than side. Defaults to false.
If false, the sheet will extend through any system intrusions other than side. In addition, MediaQuery.removePadding is used to remove opposite side's padding so that a SafeArea widget inside the sheet will not have any effect on the opposite side. If this is undesired, consider setting useSafeArea to true. Alternatively, wrap the SafeArea in a MediaQuery that restates an ambient MediaQueryData from outside builder.
In either case, the sheet extends all the way to the side of the screen, including any system intrusions.
Implementation
final bool useSafeArea;