setting specific preferences for new users when they register

extend.php

<?php


use Flarum\Extend;

return [
    (new Extend\Event)
        ->listen(\Flarum\User\Event\Registered::class, function (\Flarum\User\Event\Registered $event) {
            $event->user->setPreference('discloseOnline', true);
            $event->user->setPreference('indexProfile', true);
        }),
];