I have filed the bug report(FB23174154) and the feature request(23174302), thank you.

It's powered by a swiftui view

It's just like the normal app menu, with some text and buttons in it. But when I was using a 2d window in my immersive space, it seems that the light in the space cannot affect it, or a volume window. So I'm trying to rebuild those menu in spaceview.

Thanks again for the explanation. I added a more detailed follow-up in the full reply below. After further testing, I found some behavior around the reference-window relationship created by defaultWindowPlacement(_:), and I’d like to confirm whether that behavior is expected.

Thanks again for the explanation. I added a more detailed follow-up in the full reply below. After further testing, I found some behavior around the reference-window relationship created by defaultWindowPlacement(_:), and I’d like to confirm whether that behavior is expected.