SceneDelegate.swift

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
    // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
    guard let _ = (scene as? UIWindowScene) else { return }

    /// ↓ ADD THIS ↓
    if let rootWindow = window {
        let iPhoneXSize = CGSize(width: 375, height: 812) /// if you're running this on an iPhone X, delete this line...
        //let iPhone8Size = CGSize(width: 375, height: 667) /// ...and uncomment this line

        Projector.display(rootWindow: rootWindow, testingSize: iPhoneXSize)
    }
    /// ↑ ADD THIS ↑
    
}