The Genesis Portfolio Pro Plugin allows you to add a simple portfolio to your website. The layout settings are included in the Archive Settings, however they are not available on single portfolio items.
To Add Genesis Layouts to Single Portfolio Items, open up your functions.php file. Copy and paste this code inside there at the bottom. Save it.
Bonus: If you are using a portfolio custom post type on your website already with the “portfolio” slug, this function would also add the layout on those single posts it’s missing.