We encountered the same issue with our Mac Catalyst app. Even though we didn't a perfect fix we manage to get back the old UITabBar and having an empty gray toolbar but we didn't manage to fully hide this toolbar. Until we have a better fix or a way to fully hide this toolbar it's better than nothing. Instantiate an empty toolbar in your scene titleBar: if let titlebar = scene.titlebar { titlebar.toolbar = NSToolbar() titlebar.titleVisibility = .hidden titlebar.toolbarStyle = .unifiedCompact } In your view controller containing the UITabBar force the horizontal size class to compact: if #available(iOS 17, *) { traitOverrides.horizontalSizeClass = .compact }