How do I modify the navBar shade to crimson in SwiftUI utilizing an extension I need to apply to my view?

My extensions

    func createToolbarSettings(dismissAction: (() -> Void)?, title: LocalizedStringKey, tag: String) -> some View {
        self.toolbar(content material: {
            ToolbarItem(placement: .navigationBarLeading) {
                Button(motion: {
                    dismissAction?()
                }, label: {
                    Picture.arrowBack
                        .resizable()
                        .aspectRatio(contentMode: .match)
                        .body(width: .genericFrame, peak: .genericFrame)
                })
                .tag(tag)
            }
            ToolbarItem(placement: .principal) {
                Textual content(title)
                    .font(.montserratFontMapping(ofSize: .genericFrame, weight: .medium))
                    .foregroundColor(.white)
            }
        })
    }