code: public function setIsBulkItemsEditingAllowed($isAllowed) {
          $this->allowBulkItemsEditing = (bool)$isAllowed;
          $this->setMultiRowSelection(true);
          return $this;
      }
docs: Bulk editable columns provided via FormConfig->setBulkEditableColumns() or FormConfig->addBulkEditableColumns()
  @param bool $isAllowed - default: false
  @return $this