Laravel Cloud Navigation in Filament v4: Full tutorial and code https://silvanhagen.com/writing/laravel-cloud-navigation-in-filament/

CustomTopbar.php

<?php

namespace App\Livewire;

use Filament\Actions\Concerns\InteractsWithActions;
use Filament\Actions\Contracts\HasActions;
use Filament\Livewire\Concerns\HasTenantMenu;
use Filament\Livewire\Concerns\HasUserMenu;
use Filament\Schemas\Concerns\InteractsWithSchemas;
use Filament\Schemas\Contracts\HasSchemas;
use Illuminate\Contracts\View\View;
use Livewire\Attributes\On;
use Livewire\Component;

class CustomTopbar extends Component implements HasActions, HasSchemas
{
    use HasTenantMenu;
    use HasUserMenu;
    use InteractsWithActions;
    use InteractsWithSchemas;

    #[On('refresh-topbar')]
    public function refresh(): void {}

    public function render(): View
    {
        return view('livewire.custom-topbar');
    }
}