Introduced in V 2.10, the Package originator can control the inclusion of any additional templating fields by a signer during the signing of a document.
While creating and customizing a Package, click on the Editing tab in the Package Options.
Under the Editing tab, there is an Add toggle switch that controls the inclusion of additional templating fields. When the Add toggle switch is turned ON, the Package originator has the ability to activate the toggle switches for adding additional Signatures, Text Boxes, and Images. Depending on the selection, the corresponding templating fields become available in the Signer toolbar during the signing of a document.
See: How to Add on the fly Signatures, Images and Text Boxes
You can set the option you want for all your future Packages by updating the
Signing Defaults values: Set Your Signing Defaults