How to enable preview message on my HTC Desire 626S

Click each step to see the action. You can also click the picture or use the arrow keys.

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Preview message allows you to get a quick look at the message without having to open the app.
1. Touch Messages.
2. Touch the Menu icon.
3. Touch Settings.
4. Touch Notifications.
5. Touch Received notification.
6. Touch Heads-up notification.
7. Preview message has been enabled.
Touch Heads-up notification again to disable preview message.