We enhanced standard sharing for Knowledge to make sharing work the way it does for other Salesforce objects. Use criteria-based record-sharing rules to control which articles are exposed to your community’s guest users. Use sharing groups and sharing sets to share articles owned by High-Volume Community Users and portal users. Lightning Knowledge only.
Where: This change applies to Enterprise, Essentials, Performance, Developer, and Unlimited editions of Knowledge with Lightning Knowledge enabled. Not available in Salesforce Classic.
Why: Sharing for High-Volume Community Users is new for Knowledge for Summer ’20.
Although Guest User sharing was available with Knowledge in the Summer ’20 release, sharing in Knowledge followed external sharing rules. Now, normal Guest User security policies apply to Knowledge.
How: In Knowledge Settings, enable Lightning Knowledge and standard Salesforce sharing. For Guest User sharing, go to Setup->Sharing Settings, and set Secure guest user record access.
For sharing with High-Volume Community Users, use sharing groups and sharing sets.