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, the conditions which included this segment will no longer work correctly. Make sure you have changed ad settings in Yandex Direct: replace the deleted segments with the new ones.