Detail viewer
Detail viewer is a temporary, simple catalog preview showing the selected attributes. It is displayed when you hover the mouse over an icon in the first column in a catalog.
Unlike classical catalogs, which sometimes contain too many fields to give you the quick, condensed information, this feature enables you to get a clean layout with the raw catalog data as fast as possible.
Notes on the Customization
The customization of this feature is done in the Catalog Customizer: Define which attributes will be included in the Detail Viewer on the Columns tab in the Preview column in the Catalog Customizer.
The 'Detail Viewer' activation is done on the General tab in the same customizer.