Preview field adds a tiny icon to each row on the
Index view that, when hovered, it will display a preview popup with more information regarding that record.
field :preview, as: :preview
Define the fields
The fields shown in the preview popup are configured similarly to how you configure the visibility in the different views.
When you want to display a field in the peview popup simply call the
show_on :preview option on the field.
field :name, as: :text, show_on :preview