MenuActionDismissBehaviour .disabled "unavailable" Xcode 15.2

Hi,

Within my app, I am building a menu and don't want it to close with every click. When you click start, I want the menu to remain open etc. I have searched the documentation and this seems like exactly what I want. I am still very new to Swift so potentially making a silly mistake.

MenuActionDimissBehaviour

I have decided to play with just example code from the documentation and use within my ContextView file.

import SwiftUI

struct ContentView: View {
    @State private var count = 0
    var body: some View {
        VStack {
            
            Menu("Font size") {
                Button(action: {count += 1}) {
                    Label("Increase", systemImage: "plus.magnifyingglass")
                }
                .menuActionDismissBehavior(.disabled)
                
                
                Button("Reset", action: {count = 0})
                
                
                Button(action: {count -= 1}) {
                    Label("Decrease", systemImage: "minus.magnifyingglass")
                }
                .menuActionDismissBehavior(.disabled)
            }
            
        }
        .padding()
    }
}

#Preview {
    ContentView()
}

Xcode keeps saying "disabled" is unavailable in MacOS. I am a bit confused as the documentation says it can work from MacOS 13.3+. I am using the latest OS, latest Xcode etc.

Very confused. Any help would be greatly appreciated.

Thanks in advance