public EntityDisplayInterface::createCopy($view_mode)
Creates a duplicate of the entity display object on a different view mode.
The new object necessarily has the same $targetEntityType and $bundle properties than the original one.
string $view_mode: The view mode for the new object.
static A duplicate of this object with the given view mode.
public function createCopy($view_mode);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Display!EntityDisplayInterface.php/function/EntityDisplayInterface::createCopy/8.1.x