You can now encrypt the Comments field on these objects: Business Operations Process Participant, Compliance Control Participant, Compliance Policy Participant, Validation Procedure Participant, Financial Account Participant, and Regulation Participant. On the Case object, you can encrypt the Rich Text Area for Case Description field. On the Provider Activity Goal Limit object, you can encrypt the Source System Identifier field.
Where: This change applies to Lightning Experience in Enterprise, Performance, Unlimited, and Developer editions.