menuButtonWidth property
Implementation
var menuButtonWidth = 0.8 * PlatformDispatcher.instance.views.first.physicalSize.width / PlatformDispatcher.instance.views.first.devicePixelRatio;
var menuButtonWidth = 0.8 * PlatformDispatcher.instance.views.first.physicalSize.width / PlatformDispatcher.instance.views.first.devicePixelRatio;