Change Default WooCommerce Thumbnail Image Size for Woo Product Table

You can use wpto_thumbs_size filter to resize thumbnail. Read this article to learn about how to use filter and action hook.

Here I have added a snippet. Add this snippet to end of the child theme's functions.php file.

if( !function_exists( 'wpt1234_resize_the_thumb_size' ) ) {

function wpt1234_resize_the_thumb_size () {
    return 'woocommerce_thumbnail';
}

}
add_filter( 'wpto_thumbs_size', 'wpt1234_resize_the_thumb_size' );