Secure Guest Users’ Record Access with a New Setting
Where: This change applies to all communities accessed through Lightning Experience and Salesforce Classic in Essentials, Enterprise, Performance, Unlimited, and Developer editions.
When: This feature is available in early September.
Why: Restricting guest users’ default access to your org’s data is a Salesforce security best practice. While we strongly recommend that you enable this setting, changing sharing settings can affect your guest users’ ability to access records. Test all changes in a sandbox environment to see the effects on data sharing and visibility before you change your implementation in production.
How: From Setup, enter Sharing Settings in the Quick Find box, and select Sharing Settings. Select Secure guest user record access.