When desiging a template with e-sigining capabilities, it is critical to think how the signers will be defined.
If the 'Can select contacts' setting is enabled, by default, the related account contacts (supported objects: Account, Case, Contract, Opportunity, Quote) as well as the document author will be selectable.
It’s possible to preselect internal and external signers manually or dynamically in the 'Signing' setting tab. Examples can be found below:
Internal signers defined manually via Salesforce groups
In the 'Signing' settings tab, select a Salesforce Group via the data browser
This enables users to select any member of the group to be invited for signing a document:
Select signers from a Salesforce group during the sharing phase
Hardcoded preselected internal signer example
In the ‘Signing' tab, add an active user’s full name