The updated Control Center UI now aligns with Salesforce Lightning Design System (SLDS) standards. This update enhances the user experience with a more consistent design. Users can still access the same workflows while enjoying a refreshed interface. The new Lightning UI is the Control Center default option and is widely used by the majority of customers. Except for the audit logs, this update removes all links to the Classic UI.
To access the Control Center Lightning UI, See Control Center UI.