Thanks for getting in touch! You can configure the Post Carousel to show content above the read more button by setting Content to show under Layout. The length of the content that is shown in there is controlled by WP excerpt which you can change by putting the code below in your functions.php(appearance > editor > theme functions).
function my_excerpt_length($length) {
return 20; // Change to your desired length
}
add_filter('excerpt_length', 'my_excerpt_length');