Seems to be fixed as of Xcode 12 beta 5 (build 12A8189h).
zachss
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Hey @crystalminds - thanks for the response. Not quite the outcome I'm after. Ideally the First and Second would still show in a "Split View" style - (like the old UISplitViewController in UIKit) and only the third would behave like you've described. Not convinced it's possible in SwiftUI but I'm trying to achieve it. 😬