You can control whether message content appears in notifications for all chats or for a specific chat.
For all chats on iPhone:
- Open your phone's Settings.
- Go to Notifications → Zangi.
- Tap Show Previews.
- Choose Always, When Unlocked, or Never.
For all chats on Android:
- Open your phone's Settings.
- Go to Notifications → Notifications on Lock Screen.
- Turn Show Sensitive Content on or off.
The exact settings may differ depending on your Android device.
For a specific chat:
- Open the chat.
- Tap the contact's name at the top.
- Tap Notification Previews.
- Turn it on or off according to your preference.
When previews are hidden, you can still receive message notifications without displaying their content on your lock screen.