How can user profiles be customized in Pega?

User profiles in Pega can be customized effectively by modifying access roles, preferences, and personalizing UI layouts. This approach allows organizations to tailor the user experience according to specific needs and business requirements. For instance, adjusting access roles ensures that users have the appropriate permissions to perform their tasks, while preferences might include individual user settings that enhance productivity. Additionally, personalizing UI layouts enables users to have a tailored interface, making it easier for them to navigate and access the functionalities they need for their roles.

The other options do not provide the same level of customization. Limiting access to core features only focuses on restrictions rather than personalization. Enforcing default settings for all users would create a uniform experience that doesn't consider individual needs or preferences. Separating user profiles from application rules is relevant for functional design but does not directly enhance how user profiles can be customized to meet specific user requirements. Thus, modifying access roles, preferences, and UI layouts is the most comprehensive and effective way to customize user profiles in Pega.