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There is no popup on the Cloud when hovering over requirements. It’s impossible to do it, because Confluence Cloud doesn’t have an API for that. It was replaced by the intermediate screen with all of the details of the requirement.
No inline transformations. It was replaced with the Page transformations Transformation Wizard, which is, frankly, awesome 😉.
Please check out this page for the full comparison: Requirement Yogi Cloud vs Data Center