If Apple knew how to write documentation and provide examples, I wouldn't have to ask on this useless forum.

OK, so it was a dumb question as I now know it's possible to use VStack, HStack, etc. However, the recent macOS / Xcode update (15th March 2022) has introduced warning messages: Expression requiring global actor 'MainActor' cannot appear in default-value expression of property '_callsign'; this is an error in Swift 6 With no clues on how to solve. If only Apple would spend a little more time writing user friendly documentation.

3 days ago I said I didn't wish to sound critical. Ha!. I'd been hoping someone from Apple would come forward, even if they were to say I've been wasting my time. As we all know, they're extremely reluctant to own up when something doesn't work. SwiftUI is promoted to be cross-platform across Apple platforms - including macOS. They don't tell us this only applies for apps the size of an iPhone. I think I have every right to be critical, and I would very much appreciate a response from Apple - hopefully with some hope that I won't need to abandon this project.

If anyone would like to know a likely reason for this, please read through the thread at Swift.org Forum. Test code included.

I received an update a couple of hours ago and the problem has now fixed itself.

The problem has returned - again.