SwiftUI - Align contents of Button to the left

You can add a spacer to the HStack and padding to align the house image to the rectangle.

    var body: some View {
        Button(action: {
        }) {
            Group {
                Spacer().frame(width: 0, height: 36.0, alignment: .topLeading)
                HStack {
                    Image("home")
                        .resizable()
                        .frame(width: 24, height: 24)
                        .foregroundColor(.navigationTextGrey)
                        .padding(.leading, 30.0)
                    Text("HOME")
                        .bold()
                        .font(.system(size: 17.0))
                        .foregroundColor(Color.navigationTextGrey)
                        .padding(.leading, 4.0)
                    Spacer()
                }
                Rectangle()
                    .fill(Color.navigationTextGrey)
                    .frame(width: UIScreen.main.bounds.width - 60, height: 1)
                    .padding(.top, 6.0)
            }
        }
    }

This is the end result:

Also, instead of a rectangle, there is a divider view that does the same thing as your rectangle if you want to clean up your code a little

Divider()
       .padding([.leading, .trailing], 30)

You should try adding a Spacer and alignment for the HStack

        HStack() {
            Image("home")
                .resizable()
                .frame(width: 24, height: 24)
                .foregroundColor(.navigationTextGrey)

            Text("HOME")
                .bold()
                .font(.system(size: 17.0))
                .foregroundColor(Color.navigationTextGrey)
                .padding(.leading, 4.0)

            Spacer()
            }

Yeah this can be cleaned up a lot.

var body: some View {
    Button(action: {
    }) {
        VStack(spacing: 6) {
            HStack(spacing: 4) {
                Image("home")
                    .resizable()
                    .frame(width: 24, height: 24)
                Text("HOME")
                    .bold()
                    .font(.system(size: 17.0))
                Spacer()
            }
            Divider()
        }
    }
    .foregroundColor(.navigationTextGrey)
    .padding([.leading, .trailing], 30)
}