Which function allows users to customize their views in BillingCenter?

The dashboard customization option is the correct answer because it specifically allows users to alter the layout, content, and widgets displayed on their dashboard within BillingCenter. This function enhances user experience by enabling individuals to tailor the information and tools that are most relevant to their role or preferences, thereby improving access to important data at a glance. Users can adjust these settings to prioritize specific metrics, reports, or updates that they need for their day-to-day operations.

In contrast, while account summary features, billing history tracking, and payment method selection provide valuable information and functionality, they do not offer the same level of personalization in terms of user interface and display options. The account summary feature presents an overview of account details, billing history tracking keeps a record of transactions, and payment method selection helps in processing payments, but none of these functions allow for customization of the user's view as directly as the dashboard customization option does.