(me learning SwiftUI layout) https://twitter.com/steipete/status/1363151782428479490?s=21

LayoutPlayground.swift

//: A Cocoa based Playground to present user interface

import SwiftUI
import PlaygroundSupport

struct ContentView: View {
    var body: some View {
        HStack {
            VStack {
                HStack {
                    Spacer()
                    Text("Highlight :")
                        .background(Color.green)
                }
                Spacer()
            }
            .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
            .background(Color.yellow)

            VStack {
                HStack {
                    VStack(alignment: .leading) {
                        Text("Checkbox 111")
                        Text("Checkbox 2")
                    }
                    .background(Color.blue)
                    Spacer()
                }
                Spacer()
            }
            .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
            .background(Color.red)
        }
        .frame(width: 400, height: 200)
    }
}

PlaygroundPage.current.setLiveView(ContentView())

struct ContentView: View {
    var body: some View {
        HStack {
            Text("Highlight :")
                .background(Color.green)
                .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .topTrailing)
                .background(Color.yellow)

            VStack {
                Text("Checkbox 111")
                Text("Checkbox 2")
            }
            .background(Color.blue)
            .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .topLeading)
            .background(Color.red)
        }
        .frame(width: 400, height: 200)
    }
}

Adjusted for "stack three of these instead of putting them in a large frame; background color is not really needed" goal

struct ContentView: View {
    var body: some View {
        VStack {
            SettingsPanel()
            SettingsPanel()
        }

//        .frame(width: 400, height: 200)
    }
}

struct SettingsPanel: View {
    var body: some View {
        HStack(alignment: .firstTextBaseline) {
            Text("Highlight :")
                .background(Color.green)
                .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, alignment: .topTrailing)

            VStack(alignment: .leading) {
                Text("Checkbox 111")
                Text("Checkbox 2")
            }
            .background(Color.blue)
            .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, alignment: .topLeading)
        }
    }
}