How can I resolve this Xcode OptimizationLevelError error while previewing simple swiftui code in canvas?

I've been successful using SwiftUI for a few months with very little Xcode experience. I'm trying to add some simple help screens that I would like to preview in the SwiftUI canvas. However, I'm receiving the following error:

OptimizationLevelError: not building -Onone

The message is shown when pressing the "diagnostics" button. Problem persists after pressing "try again" button.

Xcode: Version 11.3 (11C29)
Catalina: 10.15.2 (19C57)

The code could not be simpler:

import SwiftUI

struct HelpSortView: View {
    var body: some View {
        VStack {
            Text("You can sort the list by Name, Sail Number, Class, or Favorites.")
                .lineLimit(10)
            VStack(alignment: .center) {
                Image("help-sort")
            }
        }
    }
}

struct HelpSortView_Previews: PreviewProvider {
    static var previews: some View {
        HelpSortView()
    }
}