That link URL didn't open, but I believe you meant this one: https://developer.apple.com/documentation/swiftui/understanding-the-composition-of-navigation-stack Using NavigationDestination in general isn't my problem, I didn't think. But I'll review. It seems like you are trying to tell me to use a setup that uses a place holder @State variable which I did not need to do in the previous incarnation. Any thoughts on why?

"verified the viewModels do deint when the view is removed from the screen" should actually read verified the "viewModels do deint when the next view is added" as they do not immediately deint upon removal (see comment over Button("Nil Selection") { selection = nil } in SplitViewLanding)

Yes. The original code did not have the series in it, but I'm glad to see that they updated the code! Thank you for the heads up. Also glad that the solution does not require you to generate a dataset with an extra column for series information like the LineMark example shows. That was what I was hoping to avoid. I'll post the working code in a seperate reply for posterity. Thanks for taking a look.