With the help of this feature you can hide your desired chat or WhatsApp groups. So how to activate this feature.. šµļøāāļøš
Update your WhatsApp to the latest version. After that, open the WhatsApp app on your phone. Then open the chat you want to lock and click on the profile. Then scroll down and you will see an option called 'Chat Lock'. Click on it and enable the option 'Lock this chat with fingerprint'. With this, that chat will not be visible to anyone in the main chat box.
how to open that chat again..
For this open WhatsApp.. scroll down, if you do this you will see an option called locked chats. Clicking on it and unlocking it with a thumb nail will open your hidden chat. šš²š¬