Sylius\Behat\Page\Admin\Channel\UpdatePageInterface::chooseDefaultTaxZone PHP Method

    public function chooseDefaultTaxZone($taxZone);

 /**
  * @Given I remove its default tax zone
  */
 public function iRemoveItsDefaultTaxZone()
 {
     $this->updatePage->chooseDefaultTaxZone(null);
 }