fenom_master_tag.php

<?php
/** @var modx $modx */
switch ($modx->event->name) {
    case 'pdoToolsOnFenomInit':
        $fenom->addBlockFunction('master', function (array $params, $content) use ($modx) {
            if ($modx->user->isMember('Administrator')) {
                return $content;
            }
        });
        break;
}