My featured image posts are resizing

@johnabrahamhodge: This code in the Fruitful theme’s functions.php file would account for that:

set_post_thumbnail_size( 604, 270, true );

So, you could create a Child Theme and use a similar line of code in its functions.php file to override it.

(Note that you’ll probably also want to use a plugin like Regenerate Thumbnails after you activate the Child Theme.)