bmatth1 on "[Plugin: Shortcodes Ultimate] POSTS - how to change thumbnail size"

I would like to use the same size thumbnail as my featured image. WHen I change the image size, it overlaps the excerpt text. Please let me know where to change the formatting (Layout) of the POSTS shortcode to show the full size thumbnail and excerpt in horizontal layout. Thanks

https://wordpress.org/plugins/shortcodes-ultimate/