A check on iPadOS18.2 Beta reveals that the issue is iPadOS related and seems to be fixed in iPadOS18.2.

Now, with VisionOS 1.1 RC2, the problem seems to be resolved.

var body: some Scene { WindowGroup { ContentView() .frame(minWidth: 720, maxWidth: 1280, minHeight: 720, maxHeight: 1700) } .defaultSize(CGSize(width: 1280, height: 720)) .windowResizability(.contentSize) Will assign a default size. You can also limit the resize range with .frame(minWidth, maxWidth ...)