[Koha] Unwanted Field Delete in staff client[ Guarantor information] koha 19.05

Hi how to delete Unwanted Field in staff client[ Guarantor information] when i am using "surname|fistname" it deleted from [ Patron identity not from gauarantor information patron> BorrowerUnwantedField] I am using koha 19.05 -- Y.Yatheesh Babu 8247838231