Exclude administrators from DB Post Types users connection

functions.php

<?php
// Add the code below to your functions.php file of your child theme.

// This removes all users that are administrators from being synced in DB Post Types
// Uses the `dbpt_source_exclude-{$slug}` filter
add_filter( 'dbpt_source_exclude-users', function () {

  // return the ID's of users NOT to be synced.
	return get_users( array(
		'role__in' => array( 'administrator' ),
		'fields'   => 'ids',
	) );

} );