I am using SwiftUI to create an app and I have figured out how to present a scene for my preferences window. However I have yet to find a way to modify the "About "My App"" scene. I am not even sure how to ask the question on other forums because I keep getting informations on application menus. I would like to find information on accessing/changing other menu entries in the menubar (in SwiftUI) an most specifically I would like to find out how to present a custom window (or at least custom information) when the user selects "About "My App"" I guess I don't need a solution but a pointer to documentation that will help me in my quest.

I am using Xcode 12 Beta 6 and Big Sur Beta (20A5364e). I am trying to add a help book to my application. I have the help book file. I have the help book index. I have added the help book to the code bundle resources and the files show up in my project. The problem that I am having is interpreting the documentation for the application plist file. I'm hot sure what goes where. Also I need to know if I have done the right steps to insure that editing the plist file is the only problem that I have.