• How can I achieve my goal of using a Paged TabView inside a larger ScrollView without it collapsing to zero height?

To fix height issue with TabView inside ScrollView you need to add .aspectRatio(contentMode: .fit) modifier to the TabView.

struct SomeView: View {
    var body: some View {
        NavigationView {
            ScrollView {
                TabView {
                    Text("View A")

                    Text("View B")

                    Text("View C")
                }
                .tabViewStyle(.page)
                .aspectRatio(contentMode: .fit) // <- Will fix the height issue
            }
        }
    }
}