In this Xamarin Master-Detail app, I can't find the colors of the master, detail, or nav bar anywhere. They're definitely not in the .xaml or .cs files Xamarin Forms project. And I don't see anywhere they would be specified in the Android project other than resource.designer.cs (but modifying this in my own project had no effect).
I can't post links yet. But you can google "xamarin master detail application" and it'll be there. It's from Xamarin's tutorial on Master Detail.
Thanks for looking into this,