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Assign Compact Layouts to Record Types
As with page layouts, there are separate compact layouts for each object. By default, each object derives its record highlight fields, preview cards, and action-related feed items from the predefined set of fields in the object’s read-only, system default compact layout. You can create custom compact layouts on an object-by-object basis. After you create one or more custom compact layouts, you set one as the primary compact layout for the object. The primary compact layout is then used as the new default for that object.

