Show all child posts from parent in CPT single template

Hi,

In the template of Issue post type, you can use the demo code to get the related Article posts

$connected = new WP_Query( [
    'relationship' => [
        'id'   => 'issues_to_articles',
        'from' => get_the_ID(), // You can pass object ID or full object
    ],
    'nopaging'     => true,
] );
while ( $connected->have_posts() ) : $connected->the_post();
    ?>
    <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
    <?php
endwhile;
wp_reset_postdata();

Get more details here https://docs.metabox.io/extensions/mb-relationships/#posts

Hi,

You can put the code to the template file that shows the single post, contact your theme support to ask for the template file.

If you want to use the View, please follow this documentation to know how to run PHP functions in View https://docs.metabox.io/extensions/mb-views/#running-php-functions