Typically in a scenario where you are the Sender and the Recipient has already signed a document and completed their portion of the envelope, unless the field in question is "collaborative" or their is another Recipient still waiting to take action and can use the Collaboration or Markup feature, then you will not be able to modify the field information. Basically, I suggest using "collaborate" for the field in question for future envelopes and therefore any changes made to a field by Recipients would require an "initial" next to the field from previous Recipients (who already signed). So this requires some changes to the envelope design and workflow for future envelopes. Here is some additional information on the collaborate feature...
https://support.docusign.com/en/guides/ndse-user-guide-collaborative-fields
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