The featured icon is an illustrative image that you can render with the page-image tag.
This is an illustrative icon for the page.
You would use it generally within an iterator.
With the page image tag, you can then show it with the following syntax
<!-- A box to constraint on width as a svg page image does not have any dimension constraint -->
<box width="600">
<page-image icon height="300" ratio="16:9" zoom="-6"/>
</box>
In the image tab of the metadata manager, you can:
The default value is the first icon found on the page.