Hello David, and thanks for your feedback. We are currently working on this theme, improving it day by day. To make sure you can create the same sliders as in our demo site, we have released a plugin that you can find here https://wordpress.org/plugins/yith-slider-for-page-builders/ and, in the meantime, we’ve extended the theme documentation (available here https://docs.yithemes.com/yith-proteo/ ) to be as complete as possible.
We are still working on improving the theme, and we will soon release an option to import sample data with one click. You will be able to find updated information on the theme documentation as soon as ready.
I hope this will make it easier to use the theme