Remove Storyboards from projects running iOS13 and above

Create a file with Swift & Storyboard. Removes Main.storyboard.

Delete Storyboard

Delete the term Main storyboard file base name.

Delete Main In Info.plist

Application Scene Manifest -> Application Session Role -> Item0 -> Remove the Storyboard Name.

Delete Storyboard Name

Set the ViewController to be displayed with SceneDelegate.swift.

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    guard let windowScene = (scene as? UIWindowScene) else { return }
    window = UIWindow(frame: UIScreen.main.bounds)
    let viewController = ViewController()
    window?.rootViewController = viewController
    window?.makeKeyAndVisible()
    window?.windowScene = windowScene
}

参考
Creating Apps Without Storyboards in iOS 13