The blue highlight on the icon indicates that you have liked the
specific item. Once you have liked an item, your name is automatically added to the
total number of users who liked the item's image and details. For other items, the
total count of likes are still present on the Document Library grid, whether in card
view or list view, as well as the item's specific details page.
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From the Document Library module, select the document type.
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In the list view setup, browse from the document list and select the option to
like from the Like column.
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In the card view setup, click the Like icon from the document thumbnail.
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When you select and view the details page of a specific item, you can also
click the Like icon under the Main
Information section.
The likes you set from the card view and list view are auto-saved and are also
reflected when viewing the details page of a specific item.