Customizing document library items displayed in card view
Card View option is available to all document types. When you switch to a different document type while on Card View, the Card View setup is still applied to the selected document type.
The multi-select option is only applicable when you are on List View. When viewing style records in Card View, the multi-select option is unavailable.
Available fields for customization of card is always dependent on what fields have been selected from the list view layout in Manage Views.