Which component is NOT needed to change the user interface of emails in DocuSign?

Changing the user interface of emails in DocuSign typically involves various components that directly affect how those emails appear to recipients. Email resource files and signing resource files are essential because they define the content and structure of the email communications sent to users, including how documents and signing actions are presented.

Template settings can also be influential since they allow for customization of email messages based on different document templates. This means that the way emails look and feel can be tailored to match specific branding or communication needs associated with particular documents.

On the other hand, notification settings primarily control how and when users are notified about documents needing their attention rather than altering the user interface of the emails themselves. While they manage the delivery and timing of notifications, they do not directly contribute to changing the visual or structural elements of the email interface in DocuSign. This distinction makes notification settings the correct answer to the question, as they do not serve the purpose of modifying the user interface.