The "Customize Featured Themes" feature in Kora is deprecated and not applicable to the current version. Although it may still appear in the UI, please note it's no longer supported or relevant for use in Kora.
The Themes section (1) is used for Classic Digication ePortfolios, and is not of use to the majority of Digication users. If you do need information about using the Themes section, please contact firstname.lastname@example.org
Just as with templates, themes can be featured as well so that they can be found easily when users create a new ePortfolio.