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The documentation for `ListDetailPaneScaffold` and `SupportPaneScaffold` mention a ‘extra’ pane:

“`SupportingPaneScaffold` consists of up to three panes: a main pane, a supporting pane, and an optional *extra pane*… On large screens, the scaffold displays the main pane with the supporting pane on the side. On small screens, the scaffold displays either the main or supporting pane full screen.”

It’s not clear to me in material3, or compose implementation, how this extra pane behaves … if the screen is large enough, are 3 panes shown? anyone have additional info? `ThreePaneScaffoldRole` has some insight, but I’m still confused.

You could try an emulator which is big enough to give this a try for yourself perhaps