This post is from the Activity iPhone Duo UIKit Q&A.
We ship a large production app that mixes UIKit and SwiftUI. We're planning our iPhone Duo support, but until we adopt the latest SDK, we want to understand how compatibility mode applies to our current builds.
Is there a canonical way to preview our app in compatibility mode across all iPhone Duo poses? We can build with Xcode 26.6 and run on the iPhone Duo simulator, but we can't switch poses and it's unclear whether that matches the real compatibility mode on device. We'd like to see how the app responds to each pose so we're confident in the experience users will get at launch.
