I have an Objective C project for MacOS in XCode 12.3 running on Catalina. A preferences screen shown at run time has started displaying controls in inverted vertical order, as though the Y origin is at the top (as it is for iOS) rather than the bottom (as it is for MacOS). In design view the ordering is correct. How can I fix this problem?

Where is the data for NSUserDefaults standardUserDefaults stored? I would like to edit stored values as is possible in the Windows Registry. I am using XCode 12.3 on Catalina. Finder search does not show any non-source code file on the machine which contains the persisted values.

I have downloaded an Objective-C Project CocoaSlideshow which I have modified, built, and run successfully in XCode 12.3 running on Catalina (10.15.7) but I cannot display the interface in XCode. I have created an archive and generated a .dmg file. There is no Main.storyboard file in the project. There is a message Unable to Load revisions at the bottom of the centre and right-hand panels. The Editor menu option does not include the option to display the Assistant Editor. How can I display the interface in this project?