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Is this a bug or intentionally not supported? In a UISplitViewController with a .tripleColumn style, can the supplementary column be hidden with the primary and secondary columns visible?  The doc’s say a secondary column can not be hidden, but does not mention the supplementary. Hiding the supplementary also hides the primary column. Setting the supplementary view controller to nil and hiding the supplementary column does hide it but it breaks the navigation. "Unsupported UISlidingBarState (primary visible and supplementary not visible) for calculating displayMode. This is an internal UIKit problem. <UISlidingBarState: 0x280cf5130>"