Guide on Hiding WhatsApp Message Preview on iPhoneStep 1. Launch WhatsApp on iPhone and choose "Settings" from the interface.
Step 2. Tap on "Notifications" in the next screen.
Step 3. Scroll down and find the "Show Preview" toggle. Slide left to turn off the toggle.
Now, it will not pop up the message on the notification bar anymore when there's a new message received. Of course, it's possible that after you turn off "Show Preview", the new WhatsApp messages are easily neglected when silent mode is on. So, when you want to turn message preview on, you just need to go back and turn on the "Show Preview" toggle on.