Classes/Domain/Model/OverviewNavigationItem.php
public function removeThumbnail(\TYPO3\CMS\Extbase\Domain\Model\FileReference $thumbnail) {
    $this->thumbnails->detach($thumbnail);
  }
public function removeThumbnail(\TYPO3\CMS\Extbase\Domain\Model\FileReference $thumbnail) {
    $this->thumbnails->detach($thumbnail);
  }
public function removeThumbnail ( \ TYPO3 \ CMS \ Extbase \ Domain \ Model \ FileReference $ thumbnail ) { $ this -> thumbnails -> detach ( $ thumbnail ) ; }
Removes a thumbnail from the overview navigation item.

@param \TYPO3\CMS\Extbase\Domain\Model\FileReference $thumbnail The thumbnail to be removed
Removes a thumbnail from the overview navigation item .