How to freeze row and columns in PhpSpreadsheet

    <?php
require 'vendor/autoload.php';

use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;

$spreadsheet = new Spreadsheet();
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', 'Hello World !');
$spreadsheet->getActiveSheet()->freezePane('D2');
$writer = new Xlsx($spreadsheet);
$writer->save('hello world.xlsx');