Share Records with Manual Sharing
Where: This change applies to Lightning Experience in Professional, Enterprise, Performance, Unlimited, and Developer editions.
When: This functionality is available on a rolling basis starting in the Spring ’21 release and is available to all customers by February 27, 2021.
Why: Click Sharing on the record that you want to share. In the Share window, you can manage who the record is shared with and share any associated records. Manual shares are available only for accounts, opportunities, cases, contacts, leads, and custom objects.