Custom modifier to hide the back button title.

HideBackButtonTitleModifier.swift

import SwiftUI

/// Custom modifier to hide the back button title.
/// From https://stackoverflow.com/a/62854805/412916
/// Usage: `.modifier(HideBackButtonTitleModifier())`
struct HideBackButtonTitleModifier: ViewModifier {
    @Environment(\.presentationMode) var presentation

    @ViewBuilder @MainActor func body(content: Content) -> some View {
        content
            .navigationBarBackButtonHidden(true)
            .navigationBarItems(leading: Button(action: { presentation.wrappedValue.dismiss() }) {
                Image(systemName: "chevron.left")
                    .foregroundColor(.blue)
                    .imageScale(.large)
            })
            .contentShape(Rectangle())
            .gesture(
                DragGesture(coordinateSpace: .local)
                    .onEnded { value in
                        if value.translation.width > .zero
                            && value.translation.height > -30
                            && value.translation.height < 30 {
                            presentation.wrappedValue.dismiss()
                        }
                    }
            )
    }
}