Thank you for the suggestion! I've tried using scene phases many times, and everything works except for the window closing behavior. The logging output shows everything is working correctly, but the child windows still remain displayed on screen when the parent window closes. Regarding .restorationBehavior and .defaultLaunchBehavior, I cannot use these APIs currently because these features are only available in visionOS 26 which hasn't been released yet. Is that understanding correct?"

Thank you for the suggestion! I've tried using scene phases many times, and everything works except for the window closing behavior. The logging output shows everything is working correctly, but the child windows still remain displayed on screen when the parent window closes. Regarding .restorationBehavior and .defaultLaunchBehavior, I cannot use these APIs currently because these features are only available in visionOS 26 which hasn't been released yet. Is that understanding correct?"

Thanks for the explanation. I’m new to visionOS development. Currently, my Vision Pro can only update to visionOS 2.6 — that’s different from visionOS 26, right? If 2.6 is the latest version I can use, how can I build and run a visionOS app using the approach you mentioned that supports visionOS 26 only, directly on my Vision Pro device? Or is there a simulator available for visionOS 26?