[Support request] Featured Posts grid settings

If you go to the columns overview page for documentation for this plugin (https://docs.wpshowposts.com/article/columns-overview/), there is “Featured Posts” option that shows a grid of images where the first row of images have containers sized 2/3 + 1/3, then the second row is 1/3 + 1/3 + 1/3.

For the life of me, I can’t get mine to look like this. Can anyone share more detail on how it’s accomplished?

Here’s a screenshot of what I’m talking about: https://afoqt.hissyfitdev.com/wp-content/uploads/2021/10/wpsp-featured-image-grid.jpg

I have the pro version, but I’m struggling to set up the WP SHow Posts list that makes it work. I’d appreciate some help.