Control Access to Sensitive Data with Restriction Rules (Beta)
Where: This change applies to Lightning Experience in Enterprise, Performance, Unlimited, and Developer editions.
When: The timeline for the rollout of this feature is published in the Restriction Rules group in the Trailblazer Community.
Why: Without restriction rules, users with access to an account can see its contracts, tasks, and events, even when the organization-wide default is set to Private. For custom objects, users can see all detail records. Restriction rules let you configure truly private access for these objects.
How: For information on enabling this feature, contact Salesforce. You can create and modify restriction rules using the Tooling or Metadata API. See the Restriction Rules Developer Guide (Beta) for more information.