HOW TO
In ArcGIS Enterprise Sites, the Gallery card displays multiple items simultaneously with thumbnails showing previews of app content. It can also be customized to display only specific or selected types of items. When displaying ArcGIS apps in the Gallery card, each item's thumbnail image is inherited from its item details page. It cannot be configured separately.
Displaying a map preview from the ArcGIS Experience Builder app is often preferred over the default thumbnail images. This article outlines the workflow to set the map view as the app's thumbnail in the Gallery card.

Note: For existing sites, remove and re-add the Gallery card to the layout after updating the item thumbnails to ensure the new images are displayed.
The map views are set as the thumbnails of the ArcGIS Experience Builder apps in the Gallery card.

Article ID: 000036498
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