This way of setting view controllers broke in iOS 26, causing the bug you reported: viewControllers = [firstVC, secondVC] instead, try this: if #available(iOS 26.0, *) { splitVC = UISplitViewController(style: .doubleColumn) splitVC.preferredSplitBehavior = .tile splitVC.setViewController(firstVC, for: .primary) splitVC.setViewController(secondVC, for: .secondary) } else { // your previous setup }