List Single Selection

I have some lines of code below where I can make multiple selections.

import SwiftUI

struct ContentView: View {
	@State private var selectedUsers: Set<String> = []
	@State var users = ["Susan", "Kate", "Natalie", "Kimberly", "Taylor", "Sarah", "Nancy", "Katherine", "Nicole", "Linda", "Jane", "Mary", "Olivia", "Barbara"]
	
    var body: some View {
		VStack {
			List(selection: $selectedUsers) { 
				ForEach(users, id: \.self) { user in
					Text(user)
				}
			}
			.environment(\.editMode, .constant(.active))
		}
    }
}

So the blue selection symbol appears as shown in the screenshot above. That's good. But that's not what I'm after. I just want to select one row at a time.

import SwiftUI

struct ContentView: View {
	@State var selectedUser: String?
	@State var users = ["Susan", "Kate", "Natalie", "Kimberly", "Taylor", "Sarah", "Nancy", "Katherine", "Nicole", "Linda", "Jane", "Mary", "Olivia", "Barbara"]
	
    var body: some View {
		VStack {
			List(selection: $selectedUser) { 
				ForEach(users, id: \.self) { user in
					Text(user)
				}
			}
			.environment(\.editMode, .constant(.active))
		}
    }
}

In the lines of code above, I only let myself select one row at a time. And I don't get the blue selection symbol. I wonder why? I find two or three websites where they have similar lines of code and where they select one row at a time. And they have the blue selection symbol. Why don't I get it?

Mucho thankos for reading.