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To create a muted background in SwiftUI, you can follow the following process:

1. Create a ZStack that will house your content and the background view.
2. Add a Rectangle with the desired muted color (e.g. gray) to the ZStack as the background view.
3. Set the opacity of the Rectangle to a value less than 1 (e.g. 0.5) to make it semi-transparent.
4. Place your content components on top of the Rectangle in the ZStack.

Here is an example code snippet that creates a muted background:

struct ContentView: View {
    var body: some View {
        ZStack {
            Rectangle()
                .foregroundColor(Color.gray.opacity(0.5))
                .edgesIgnoringSafeArea(.all)

            Text("Hello, world!")
                .font(.largeTitle)
                .fontWeight(.bold)
        }
    }
}

In this example, the Rectangle with a gray color is set as the background view by adding it to the ZStack with .edgesIgnoringSafeArea(.all) to make it cover the entire screen. The Text component, which represents the content of the screen, is placed on top of the Rectangle.