There are a few methods listed here I personally use ZStack

swift: Screen background color in SwiftUI.swift

// Using ZStack
var body: some View{
  ZStack {
    Color.blue.ignoreSafeArea()
    // Other content goes here
    // NOTE: The other content will respect the safe area
  }
}

// Using Overlay Modifiers
var body: some View{
  Color.blue.ignoreSafeArea(.vertical) // Ignore just for the color
            .overlay(
              VStack(spacing: 20) {
                Text("Overlay").font(.largeTitle)
                Text("Example").font(.title).foregroundColor(.white)
              }
            )
}