A side rail that moves to the outer edge in Split View
うどぅん tuned their app's navigation on the Duo. Open, a list sits beside the item with a rail down the right; in Split View, the rail moves to whichever outer edge the app is on, away from the crease and the other app.
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More ideas
The whole wall
10 things to know before you design for iPhone Duo
Craig Clayton's animated explainer, with the SwiftUI code for each point: controls moving to the side when closed, content shifting off the hinge half-folded, sheets placing themselves, and two apps side by side.