Thanks, but Xcode 15.2 was more than sufficient to target any version of iOS 15. Per Apple: Xcode 15.2 includes SDKs for iOS 17.2, iPadOS 17.2, tvOS 17.2, watchOS 10.2, macOS Sonoma 14.2, and visionOS. The Xcode 15.2 release supports on-device debugging in iOS 12 and later I've since upped my target to iOS 17 so the problem is moot.

Thanks guys. @RickMaddy has answered the obvious question that arises from the rules that @darkpaw has generously provided: If I never double-clicked, how did I end up with five tabs? Apparently I edited in the other four.