Meta Blog – 6.20.23
Protecting the privacy of your messages remains the driving force behind what we’re building at WhatsApp. While End-to-end encryption is the foundation to ensure your calls and messages are secure, we continue to add more layers of privacy on top including the recently launched Chat Lock to protect sensitive chats behind a password, Disappearing Messages that vanish, screenshot blocking for View Once, and the ability to keep your online presence private.
Source: New WhatsApp Privacy Features: Silence Unknown Callers and Privacy Checkup | Meta