How do you accomplish the views peeking on the sides in portrait like the demo at the top has?

How do you accomplish the views peeking on the sides in portrait like the demo at the top has?

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How do you accomplish the views peeking on the sides in portrait like the demo at the top has? I’ve been trying to figure this problem out for ages

How do you accomplish the views peeking on the sides in portrait like the demo at the top has? I’ve been trying to figure this problem out for ages