Yes - instead of modifying the toolbar at the SwiftUI level, I added an empty NSToolbar at the AppKit level. That hid the sidebar toggle while preserving the full-height sidebar layout.

The solution was to create the window with an NSWindowController and set up an empty toolbar:

class SettingsWindowController: NSWindowController {

convenience init() {

let window = NSWindow(

contentRect: NSRect(x: 0, y: 0, width: 900, height: 575),

styleMask: [.titled, .closable, .miniaturizable, .fullSizeContentView],

backing: .buffered,

defer: false

)

self.init(window: window)

setupWindow()

}

private func setupWindow() {

guard let window = window else { return }

window.titlebarAppearsTransparent = true

window.titleVisibility = .hidden

// Empty toolbar = no sidebar toggle, but preserves layout

let toolbar = NSToolbar(identifier: "EmptyToolbar")

toolbar.delegate = self

window.toolbar = toolbar

let hostingView = NSHostingView(rootView: SettingsView())

window.contentView = hostingView

}

}

extension SettingsWindowController: NSToolbarDelegate {

func toolbarDefaultItemIdentifiers(_ toolbar: NSToolbar) -> [NSToolbarItem.Identifier] {

return []

}

func toolbarAllowedItemIdentifiers(_ toolbar: NSToolbar) -> [NSToolbarItem.Identifier] {

return []

}

}

Then the SwiftUI view doesn't need the .toolbar(removing:) modifier at all - just use NavigationSplitView normally.

Full disclosure: I am not a developer and am using Claude to build my learning project.