Open the Chat: Open WhatsApp and go to the chat you want to lock.
Open Chat Settings: Tap on the contact or group name at the top.
Enable Chat Lock: Scroll down to “Chat Lock” and toggle on “Lock this chat with fingerprint” (or face ID, if available).
Confirm Security: Verify your fingerprint or face ID to enable the lock.
Access Locked Chats: Exit the chat. On the main chat screen, a “Locked Chats” section will appear. Tap on it and use your fingerprint, face ID, or password to view the locked chat.
