The Xcode 11 beta release notes mention:
"Xcode 11 beta doesn’t support working with SwiftUI in a project configured to use UIKit for Mac."
Source: https://developer.apple.com/documentation/xcode_release_notes/xcode_11_beta_release_notes
Does anyone know if this is a temporary limitation that will be resolved before Xcode 11 is released? Or is this a fundamental limitation of SwiftUI?