How to set up Home Page to show the three best pictures – as in the demo?

Aloha! Bold Photography Pro theme on www.willigphotography.com On the demo from Bold Photography Pro I am seeing the feature to show three pictures right on the Home Page which can be selected by 01, 02 and 03 as well as by the arrows. https://catchthemes.com/demo/bold-photography-pro/ How am I setting this up on my own page? I would have thought that this can be done by uploading additional header media pictures. Doesn't work that way though apparently... Thanks upfront! Thomas