I'm studying "scrollable stack view". I find that the sample code from Apple can directly drag and use the "scrollable stack view" control in window view. The sample code link: https://developer.apple.com/documentation/appkit/views_and_controls/organize_your_user_interface_with_a_stack_view?language=objc Then I try to code an imitation of the "scrollable stack view", but I don't find the "scrollable stack view" in Xcode 12. So my question is Where the "scrollable stack view" in xcode? See the following screenshot: