Can't get slider to display

I have purchased the Delicacy Pro theme, and am having trouble getting the slider to show.

I’ve added a post, assigned it to the category Homepage, added a featured image of 588×289 pixels, and turned slider on in theme options (showing excerpts, but I’ve tried full content too). Nothing is displaying at all.

Any ideas? My site link is https://www.prachinindianrestaurant.com.au/wordpress. Thanks