recent posts as 3 columns on home

Here is the website: https://www.lrdelearning.org/staging_public/

use
.home .article-container li
instead of simple
.article-container li

This way you’ll limit that custom width just in home.

Thanks for that. Is there a way I can get the image above the title with the same width as the column?

Yep but what about the height?
anyway:

add_filter( 'tc_post_list_layout', 'my_post_list_layout');
function my_post_list_layout($layout) {
    if ( ! tc__f('__is_home') )
        return($layout);

    return array(
        'content'           => 'span12',
        'thumb'             => 'span12',
        'show_thumb_first'  => true,
        'alternate'         => false
     );
}

reference: https://www.themesandco.com/snippet/movehide-post-images/

Great. How can I adjust the amount of excerpt, make the titles link to the story and also adjust the height of the article box and image? Can’t any of this be adjusted through css or is it all within the php? cheers!

excerpt: https://codex.www.ads-software.com/Function_Reference/the_excerpt#Control_Excerpt_Length_using_Filters

images: css, or change thumbnails size -> https://www.themesandco.com/customizr/guide-css-html-customizr-wordpress-theme/ https://www.themesandco.com/customizr/css-glossary-for-the-customizr-wordpress-theme/
https://www.themesandco.com/snippet/changing-default-image-sizes-customizr/

article-box: css (see references above)