Thanks, Quinn “The Eskimo!”. It's very useful to know that the message re DetachedSignatures is log noise. I will give others a little more time to comment on my problem in the hope that someone has a solution. Failing that, I will submit a bug report via Feedback.

While you cannot speak to anyone, you can use the Reply button that appears at the bottom of the Review Team's rejection message in App Store Connect. Please see the instructions at this link: https://developer.apple.com/help/app-store-connect/manage-submissions-to-app-review/reply-to-app-review-messages). It may be that you do not need to display your privacy policy in your app; I believe that Apple expects you to provide a link to your policy document. Please see the instructions at this link: [https://developer.apple.com/help/app-store-connect/manage-app-information/manage-app-privacy).

Using the modifier .environment(\.horizontalSizeClass, .compact) does work but it disables NavigationSplitView code so, if you only have Stack Views in your app, it’s fine; however, it’s not a viable option for me. I’m losing half of an active Search Bar (including its Cancel Button) under the left hand edge of a Tab Bar in Portrait orientation. The Search Bar sits below the Navigation Bar in Portrait orientation, avoiding any conflict with the Tab Bar, until it is activated. I wish it stayed put!