Quotation doesn't show customer name

please let us know how to get the customer name in Quotation without creating customer, directly from lead and opportunity.
as there is only address seen in Quotation, but no customer name

Pl suggest.
check screenshot…

use {{ doc.customer }} or {{ doc.customer_name}} to fetch customer name.

where is that? which folder?

No not in folder…you have to write in Print format (custom print format)script inside “HTML” section.