horizon.php

<?php

use Illuminate\Support\Str;

return [

    /*
    |--------------------------------------------------------------------------
    | Horizon Domain
    |--------------------------------------------------------------------------
    |
    | This is the subdomain where Horizon will be accessible from. If this
    | setting is null, Horizon will reside under the same domain as the
    | application. Otherwise, this value will serve as the subdomain.
    |
    */

    'domain' => null,