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WhatsApp's new updates might at times be a boon as well as a curse. Authentication feature is a new feature that is being worked on by WhatsApp
which will prevent you from taking screenshots of the conversations.
seems to be still working on the feature and taking screenshots of the conversation might still be retained. Fingerprint identification might be required for the authentication feature to work.
This feature was available in the 2.19.106 update in the month of April. However, the new beta update introduces new UI and a better WhatsApp doodle.