For Salesforce Customer Identity, take advantage of security and usability updates and a new authorization flow.
Where: These changes apply to LWR, Aura, and Visualforce sites accessed through Lightning Experience and Salesforce Classic. Most of the changes are available in Enterprise, Performance, Unlimited, and Developer editions, except for the update to headless identity flows, which is available only in Enterprise, Unlimited, and Developer editions.
Identity and Access Management Enhancements for Experience Cloud (salesforce.com)