This post is from the Activity iPhone Duo UIKit Q&A.
"When implementing SegmentedControl for container navigation on Apple Duo:
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What's the optimal segment placement when the screen is folded (top, side, or hidden)?
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How do we handle segment state persistence across fold transitions?
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Should we use a single SegmentedControl for both screens or separate ones per display?
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Are there performance implications for frequent container switching on dual screens?"