Hello, @Steve Good,
Thanks for choosing our theme and for contacting us.
Actually, in that demo, we created that home page slider using the Static Blocks, If you edit the particular page and scroll below, you will find the page options, and under page options, you will find “Banner Type” set as “Banner Block”, please refer to this screenshot: https://postimg.cc/zVyBtYVJ
So please go to Porto >> Template Builder >> Blocks and finds and edit the particular block with Elemntor page builder, please refer to this screenshot: https://postimg.cc/1nzP8DF9
After editing, you have to edit the column under the inner section and change the “Banner Image” as per your requirements: https://postimg.cc/8JdKgYcc
Hope this helps.