Add custom field support to LearnDash post types

snippet.php

// https://developer.wordpress.org/reference/functions/add_post_type_support/

add_action( 'init', 'lelandf_custom_fields_support_learndash' );
function lelandf_custom_fields_support_learndash() {
    $post_types = [
        'sfwd-courses',
        'sfwd-lessons',
        'sfwd-topic',
    ];
     
    foreach ( $post_types as $post_type ) {
        add_post_type_support( $post_type, 'custom-fields' );
    }
}