my scene is not scaling

In my ViewController the code I have             if let myScene = SKScene(fileNamed: "GameScene") {             

                // Set the scale mode to scale to fit the window

                myScene.backgroundColor = UIColor.gray

                myScene.scaleMode = .resizeFill

my scene file looks like this in xcode

my scene in simulator looks like this

I have tried aspect fit and fill.

Anyone any hints for me?