code: public function setView($pValue)
      {
          // MS Excel 2007 allows setting the view to 'normal', 'pageLayout' or 'pageBreakPreview' via the user interface
          if ($pValue === null) {
              $pValue = self::SHEETVIEW_NORMAL;
          }
          if (in_array($pValue, self::$sheetViewTypes)) {
              $this->sheetviewType = $pValue;
          } else {
              throw new PhpSpreadsheetException('Invalid sheetview layout type.');
          }
  
          return $this;
      }
docs: Set View.
  
  Valid values are
  'normal'            self::SHEETVIEW_NORMAL
  'pageLayout'        self::SHEETVIEW_PAGE_LAYOUT
  'pageBreakPreview'  self::SHEETVIEW_PAGE_BREAK_PREVIEW
  
  @param string $pValue
  
  @throws PhpSpreadsheetException
  
  @return SheetView