Display only thumbnail and title

Thank you for such an amazing plugin. I am using this code.

<?php
$cat = get_category( get_query_var( 'cat' ) );
$category = $cat->slug;
echo do_shortcode('[ajax_load_more category="'.$category.'" scroll="false" transition="fade" button_label="LOAD MORE PROFILES"]');
?>

This displays posts in a conventional fashion with thumbnail, title, date, excerpt and readmore, which is great, but I would only like to display a thumbnail with a specific size eg. the_post_thumbnail(‘cover’). So how can I accomplish this. I may have a little more changes to make in the loop. Where do I make the changes. Where does it import this loop from ? Great plugin BTW.

https://wordpress.org/plugins/ajax-load-more/