code: private function readHcenter()
      {
          $length = self::getUInt2d($this->data, $this->pos + 2);
          $recordData = $this->readRecordData($this->data, $this->pos + 4, $length);
  
          // move stream pointer to next record
          $this->pos += 4 + $length;
  
          if (!$this->readDataOnly) {
              // offset: 0; size: 2; 0 = print sheet left aligned, 1 = print sheet centered horizontally
              $isHorizontalCentered = (bool) self::getUInt2d($recordData, 0);
  
              $this->phpSheet->getPageSetup()->setHorizontalCentered($isHorizontalCentered);
          }
      }
docs: Read HCENTER record.