I have downloaded a source code of SwiftUI app from github, which was originaly written using @NSApplicationMain and AppDelegate inheriting from NSObject.

I would like to transfer to @main with struct conforming to App protocol. So deleted the original AppDelegate class and I instead of that class I put there this code

@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

However I dont see any windows being drawn and if I put a breakpotn at var: body, it is not being catched. Do I have to specifiy the main somwhere else in the project? I thought marking it with @main is enough

Found a solution myself, I had to remove main.storyboard from within the project file.