Which of the following represents a simple change in a User Interface configuration?

Changing field labels is a straightforward modification in a User Interface configuration because it does not affect the overall architecture or structure of the interface. Instead, it merely alters the text displayed in specific fields, making it user-friendly or more relevant to the context without necessitating extensive changes to the layout or functionality of the screen.

In contrast, changing screen layout involves rearranging the entire layout of elements, which can be more complex and may require additional considerations regarding usability and design consistency. Adding new screens goes beyond a simple change, as it involves integrating new components into the application, which can impact navigation and workflow. Implementing screen-based logic signifies a significant change to how users interact with screens, adding conditional behaviors that depend on various inputs and state changes, thus introducing complexity to the user interface. Therefore, changing field labels stands out as the simplest option among the choices provided.