Changing the Background Color in SAB on Windows or on the Mac

We changed the background color of the Scripture text in the app. In SAB on Windows we did that by going to SAB > Colors > Main Colors and changed the BackgroundColor value. On the Mac, however, this didn’t work. I finally figured out that I had to change the value of Pane1BackgroundColor to make this work in the iOS app. There is only one book collection in this app.
It would be good if it would be the same on both platforms.