How to change toolbar title color in SwiftUI when running on macOS Catalyst?

In my SwiftUI based iOS app I style the the navigationBar / toolbar to be black. Of course this requires the title (+ other content) to be white / use light mode to be visible.

While this works fine in iOS, setting the .toolbarColorScheme to .dark has no effect on Catalyst. The tile (+ other content linke ToolbarItems) always appears dark and is thus not visible on the black background.
Even using UINavigationBar.appearance() very early in app init to globally set the styling has no effect on Catalyst (and would not work, because this would effect all navigation bars in the app)

Using a custom tile is also completly ignored in Catalyst (still shows "Some Page")

.toolbar { ToolbarItem(placement: .principal) { Text("Custom Titel") .foregroundColor(.white) .font(.headline) } } }

So, how to correctly style the toolbar when running on Catalyst?

EDIT: Thank so the hint by @BenzyNeez I found out, that the problem only occurs, when in the target settings under "Mac Catalyst Interface" the option "Optimized for Mac" is active. When using "Scaled to match iPad" instead, it works as expected. However, this has other side effects. Is there a solution to change the title Color when using "Optimized for Mac"