code: public function resetStart($startRow = 1)
      {
          if ($startRow > $this->subject->getHighestRow()) {
              throw new PhpSpreadsheetException("Start row ({$startRow}) is beyond highest row ({$this->subject->getHighestRow()})");
          }
  
          $this->startRow = $startRow;
          if ($this->endRow < $this->startRow) {
              $this->endRow = $this->startRow;
          }
          $this->seek($startRow);
  
          return $this;
      }
docs: (Re)Set the start row and the current row pointer.
  
  @param int $startRow The row number at which to start iterating
  
  @throws PhpSpreadsheetException
  
  @return RowIterator