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The Used by tab lists what this version draws from: Cards used by destination and Segments used by destination, each with its own count. The Used by tab Names link to the card or segment, and the expand icon opens a table full-screen. The same counts appear as Based on cards in the destination header.

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Why it matters

Changing a card or segment listed here changes this API. Removing a property from the card removes it from the response; narrowing a segment removes entries from the endpoint — without anyone republishing the destination.
A card that is not Active also blocks publishing this version, so check the status column when Publish is disabled.
The reverse view exists too: a card shows which destinations consume it, and a segment the same. See Track usage of a card and Track usage of a segment.