Show the featured image from each post on Wordpress dashboard.

featured-thumbnail-column.php

<?php
// GET FEATURED IMAGE
function ST4_get_featured_image($post_ID) {
    $post_thumbnail_id = get_post_thumbnail_id($post_ID);
    if ($post_thumbnail_id) {
        $post_thumbnail_img = wp_get_attachment_image_src($post_thumbnail_id, 'featured_preview');
        return $post_thumbnail_img[0];
    }
}

// ADD NEW COLUMN
function ST4_columns_head($defaults) {
    $defaults['featured_image'] = 'Foto principal';
    return $defaults;
}
 
// SHOW THE FEATURED IMAGE
function ST4_columns_content($column_name, $post_ID) {
    if ($column_name == 'featured_image') {
        $post_featured_image = ST4_get_featured_image($post_ID);
        if ($post_featured_image) {
            echo '<a href="' . admin_url('post.php?post=' . $post_ID . '&action=edit') . '"><img src="' . $post_featured_image . '" /></a>';
        }
    }
}

add_filter('manage_posts_columns', 'ST4_columns_head');
add_action('manage_posts_custom_column', 'ST4_columns_content', 10, 2);