Which component would you mostly customize for styling an entire application user interface?

The skin rule is the primary component designed to customize the overall styling of an application user interface in Pega. It provides a centralized location for defining the visual aspects and styling options that can be applied consistently throughout the application. With the skin rule, developers can specify elements such as color schemes, fonts, spacing, and user interface components, ensuring a cohesive visual identity across screens and elements within the application.

This makes the skin rule an essential tool for developers seeking to create a uniform look and feel while also enabling responsive design and branding alignment. By using the skin rule, the customization affects all areas of the application that leverage the defined styles, making it the most effective choice for application-wide styling changes.