The easiest way to keep WhatsApp chat secret
To stay discreet, a simple method for doing this is given by WhatsApp itself to its clients.

As indicated by The Sun, WhatsApp has a component that the vast majority don’t know about. In this component, you can put your unique mark or face lock on your WhatsApp so that regardless of whether your telephone falls under the control of another person, it will be yours. Couldn’t open WhatsApp.
This component of WhatsApp is accessible for the two iOS and Android clients. To initiate this element, Android clients need to go to Settings, Accounts and afterward Privacy choice.
To stay discreet, a simple method for doing this is given by WhatsApp itself to its clients.
As indicated by The Sun, WhatsApp has a component that the vast majority don’t know about. In this component, you can put your unique mark or face lock on your WhatsApp so that regardless of whether your telephone falls under the control of another person, it will be yours. Couldn’t open WhatsApp.
This component of WhatsApp is accessible for the two iOS and Android clients. To initiate this element, Android clients need to go to Settings, Accounts and afterward Privacy choice.
Whatsapp Chat Secret
There you will see the Fingerprint Lock option, turn it on from here and confirm your fingerprint. After that you can also set the timing of the lock to see how long it takes for the WhatsApp to lock automatically after it is open.
IOS users also go to Settings, Account and then Privacy, here at the end you will see the screen lock option, by going to it you can use ‘Touch ID’ or ‘Face ID’ to access WhatsApp. You can choose to lock.
It will also depend on your iPhone model. You can turn off this feature at any time on Android or iOS.