[Theme Horse Support Team]

Hi NewGarden,

You have to set featured image with minimum 1038 X 460 pixel image for narrow layout to be displayed in slider as well as in blog image large post.

We have set the featured image in your site and added a slider for third blog post but the image size is not seems like 1038 X 460px so slider is not getting a proper layout.
You can change the featured image to recommended size for proper display layout.

Thank you!