ProjectPanelProvider.php

<?php

use App\Filament\Resources\MilestoneResource;
use App\Filament\Resources\TaskResource;
use Filament\Navigation\NavigationBuilder;
use Filament\Navigation\NavigationGroup;
use Filament\Navigation\NavigationItem;
use Filament\Panel;
 
public function panel(Panel $panel): Panel
{
    return $panel
        // ...
        ->navigation(function (NavigationBuilder $builder): NavigationBuilder {
            $tenant = Filament::getTenant();

            // Provides the link for the tenant switch menu.
            $builder->items([
                NavigationItem::make('Project Overview')
                    ->icon('heroicon-o-home')
                    ->url(fn () => route('filament.project.pages.dashboard',
                        ['tenant' => $tenant]))
            ]);

            // Only build the full navigation for the current tenant, otherwise you
            // end up with extra queries if you want to display count badges.
            if (auth()->user()->current_project_id === $tenant->id) {
                $builder->groups([
                    NavigationGroup::make($tenant->name)
                        ->items([
                            ...TaskResource::getNavigationItems(),
                            ...MilestoneResource::getNavigationItems(),
                        ]),
                ]);
            }

            return $builder
        ]);
}