Remove/change section header background color in SwiftUI List

No need to change appearance of all lists or do anything strange, just:

1. (Optional) Put .listStyle(GroupedListStyle()) on your List if you do not want sticky headers.
2. Set the listRowInsets on the section to 0.
3. Set the Section.backgroundColor to clear to remove the default color, or whatever color you want to color it.

Example:

List {
    Section(header: HStack {
        Text("Header")
            .font(.headline)
            .foregroundColor(.white)
            .padding()

            Spacer()
    }
    .background(Color.blue)
    .listRowInsets(EdgeInsets(
        top: 0,
        leading: 0,
        bottom: 0,
        trailing: 0))
    ) {
        // your list items
    }
}.listStyle(GroupedListStyle()) // Leave off for sticky headers