Clusters: Account Settings with Sub-Navigation

First, the cluster must be enabled in the panel's service provider by adding additional discoverClusters() method.

class AdminPanelProvider extends PanelProvider
{
    public function panel(Panel $panel): Panel
    {
        return $panel
            // ...
            ->discoverResources(in: app_path('Filament/Resources'), for: 'App\\Filament\\Resources')
            ->discoverPages(in: app_path('Filament/Pages'), for: 'App\\Filament\\Pages')
            ->discoverClusters(in: app_path('Filament/Clusters'), for: 'App\\Filament\\Clusters');
    }
}

The cluster is created using an Artisan command and named AccountSettings.

php artisan make:filament-cluster AccountSettings

Three custom pages are created for the cluster using an Artisan command. During the custom page creation, the cluster's namespace is chosen.