Which of the following is related to changes in the user interface?

The correct choice relates specifically to modifications made in the user interface of applications. Page Configuration Formats are setting options that determine how user interface elements are arranged and displayed to users within the application. This may include adjustments to the layout, styling, and overall appearance of pages, making it crucial for enhancing user experience and interface functionality.

In contrast, the other options serve different purposes within the Guidewire platform. Data Model Formula deals with the rules and logic behind the data stored in the system, impacting how data is processed and calculated rather than how it is visually presented. Application Logic refers to the backend operations that dictate how the application functions, including business rules and workflows, focusing on processes rather than user interface design. Entities are the core components of the data model that represent the various elements within the application, such as policy, claims, and customer records, again emphasizing data structure rather than interface presentation. Thus, Page Configuration Formats is the most relevant option regarding changes to the user interface.