@jaxaviation: Sorry I don’t get it what you want. Can you let me know the desire result.
If you read Catch Evolution theme instructions at http://catchthemes.com/theme-instructions/catch-evolution . It shows the image sizes that theme uses. This is to match the design and width of the theme. T
This auto featured image and the excerpt text is shown when you have selected Content Layout as “Excerpt/Blog Display” from “Appearance => Theme Options => Layout Options”. If you don’t like this then you can choose “Full Content Display” as your Content Layout. This will load full content from your post that you have inserted. This option will not show the featured image. Then you can use
to slitting content. Read more about slitting content at https://en.support.wordpress.com/splitting-content/more-tag/