// Put this in top
use DompdfDompdf;
use DompdfOptions;

public function DownloadPdf($id , $download = false){
      // instantiate and use the dompdf class
      $options = new Options();
      $options->set('enable_remote', true);
      $options->set('enable_css_float', true);
      $dompdf = new Dompdf($options);
      $dompdf->loadHtmlFile(action('HomeController@PdfHTML',['id'=>$id]));

      // (Optional) Setup the paper size and orientation
      $dompdf->setPaper('A4', 'portrait');

      // Render the HTML as PDF
      $dompdf->render();
      if($download == true){
        // Save PDF to server
        file_put_contents('uploads/pdf/document_'.$id.'.pdf', $dompdf->output());
      }else{
        // Output the generated PDF to Browser
        $dompdf->stream('document');
      }
    }

public function PdfHTML($id){

      return view('home.home_pdf');
    }

<h2>Hello world</h2>