Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Style/Alignment.php
public function setShrinkToFit($pValue)
    {
        if ($pValue == '') {
            $pValue = false;
        }
        if ($this->isSupervisor) {
            $styleArray = $this->getStyleArray(['shrinkToFit' => $pValue]);
            $this->getActiveSheet()->getStyle($this->getSelectedCells())->applyFromArray($styleArray);
        } else {
            $this->shrinkToFit = $pValue;
        }

        return $this;
    }
public function setShrinkToFit($pValue)
    {
        if ($pValue == '') {
            $pValue = false;
        }
        if ($this->isSupervisor) {
            $styleArray = $this->getStyleArray(['shrinkToFit' => $pValue]);
            $this->getActiveSheet()->getStyle($this->getSelectedCells())->applyFromArray($styleArray);
        } else {
            $this->shrinkToFit = $pValue;
        }

        return $this;
    }
Set Shrink to fit.

@param bool $pValue

@return Alignment