Which fields are displayed and where, as well as the details of their individual appearance, is controlled by the page layout ...

Which fields are displayed and where, as well as the details of their individual appearance, is controlled by the page layout being used.

The page layout itself draws from a set of available fields defined by its associated content type or page layout group.

Content authors creating pages that use a given page layout fill in the fields displayed in that page layout with content.

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