How to make prepopulate signature Empty from Zoho Sign API?

How to make prepopulate signature Empty from Zoho Sign API?

Hello Everyone

I'm new zoho sign developer, I have an issue in my document flow. I want to make pre-populate signature field to empty value from Zoho Sign API, but when user click the signature it's always filled with (recipient_name).

How to make this field default empty from zoho sign api so, users will always type their signature manually?

Rgds

Ahmad