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Awesome solution! I was able to make the zoom button disable with your solution.This is my Swift version:I created a MacHelperBundle, created a Helper.swift:import AppKit public class Helper { /// Disable the zoom button for window. /// - Parameter window: The window to disable. @objc static func disableZoomButton(for window: NSWindow) { window.standardWindowButton(.zoomButton)?.isEnabled = false } }In the app target func scene(_: UIScene, willConnectTo _: UISceneSession, options _: UIScene.ConnectionOptions) { #if targetEnvironment(macCatalyst) // ... DispatchQueue.main.async { [weak self] in guard let builtInPlugInsPath = Bundle.main.builtInPlugInsPath else { return } let bundlePath = builtInPlugInsPath + "/MacHelperBundle.bundle" guard let bundle = Bundle(path: bundlePath) else { return } bundle.load() guard let window = self?.window?.nsWindow else { return } let macHelper = bundle.classNamed("MacHelperBundle.Helper") as AnyObject _ = macHelper.perform(NSSelectorFromString("disableZoomButtonFor:"), with: window) } #endif // ... } extension UIWindow { /// Get the NSWindow from self. var nsWindow: AnyObject? { guard let nsWindows = NSClassFromString("NSApplication")?.value(forKeyPath: "sharedApplication.windows") as? [AnyObject] else { return nil } for nsWindow in nsWindows { let uiWindows = nsWindow.value(forKeyPath: "uiWindows") as? [UIWindow] ?? [] if uiWindows.contains(self) { return nsWindow } } return nil } }