How to have cover image appear on Blog Post after import from WP

I imported 400 blog posts from Word Press to Wix.

The featured image in WP would show up as the first graphic element on my blog post page and as a thumbnail in the feed view on the main blog page.

In Wix, those featured images transferred into the "Display Cover Image" spot but they do not show anywhere but as a thumbnail for the blog feed on the main page.

How can I quickly make the cover images appear as the first element on my Wix blog post pages?

Here's my blog in case someone wants to see what I mean. Navigate to the website. Then click on any post, while paying attention to the thumbnail.

Notice that the thumbnail does not appear in the blog post after it loads

https://www.familyhistoryfanatics.com/blog