I found this answer - https://stackoverflow.com/a/58427754/11704346 on StackOverflow regarding setting the background color for a navigation bar in SwiftUI, and the same solution can be used here:
.background(NavigationConfigurator {nc in
nc.setToolbarHidden(false, animated: false)
})
KuriiboShoe
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I can't seem to find the source code for BookClub, but there's another sample project for a multi-platform called Fruta, which IIRC covers most of the same ground:
Fruta: Building a Feature-Rich App with SwiftUI - https://developer.apple.com/documentation/swiftui/fruta_building_a_feature-rich_app_with_swiftui
Solved: I had an old Swift toolchain installed, and even though it wasn’t selected in Xcode’s preferences, deleting it fixed the issue.