coolify/app/Providers/HorizonServiceProvider.php

<?php

namespace App\Providers;

use App\Models\User;
use Illuminate\Support\Facades\Gate;
use Laravel\Horizon\HorizonApplicationServiceProvider;

class HorizonServiceProvider extends HorizonApplicationServiceProvider
{
    public function boot(): void
    {
        parent::boot();
    }

    protected function gate(): void
    {
        Gate::define('viewHorizon', function ($user) {
            $root_user = User::find(0);

            return in_array($user->email, [
                $root_user->email,
            ]);
        });
    }
}