Notification bar previews on chat apps?

[AC Question]

Hey guys. This is a little of a too much detailed question but any help would be appreciated.

This is what I want:
For whatsapp,viber,messanger,texting, I want just the icon on my notification bar (no name or preview of the message).

But then when I drag down the notification bar, I would like to see the preview and the sender.

Is there a way to accomplish this? I tried all the settings but couldn't do it.

thank you!

 

[Rukbat]

All of that is done by the app, so there's a way to accomplish it, but the app developer has to do it. There's no way for you to change how an app makes its notifications.