Deleting a segment
To delete a segment, click on in the string and choose the relevant option from the menu.
If a segment was used to create other segments, you can't delete it until you have deleted all the segments that are based on it.
If the deleted segment was used in Yandex.Direct or Yandex.Display, the conditions which included this segment will no longer work properly. Make sure you have changed advertising settings in Yandex.Direct or Yandex.Display, replacing the deleted segments with the new ones.