The two-step authentication feature lets you add a six-digit passcode to WhatsApp that needs to be entered whenever you log-in with your WhatsApp account on another phone. WhatsApp also asks about this passcode once every 72-hours as a measure to make sure the account is in safe hands. To enable the two-step authentication, go to Settings > Account > Two-step Verification > Enable.
Now, you do not have to rely on third-party apps to lock the WhatsApp as the app now has a native biometric lock. WhatsApp for Android now has the option to set fingerprint lock for the app whereas the WhatsApp for Apple iPhones comes with the option of setting the FaceID or TouchID for the app– whichever is available for that specific phone.
The new group settings of WhatsApp allow you to choose who can add you in a group. You can select whether you want to be added to a group by Everyone, your contacts (My Contacts), or Nobody.
WhatsApp gives you the option to set your display picture or DP private or hidden from people who aren’t in your contact list. You can set it to be seen by everyone, your contacts only, or no one. To protect your DP, go to Settings > Accounts > Privacy. Now tap on “Profile photo” and select the relevant option.