在我的三星Galaxy Note 8上的Android 9.0馅饼更新8时，我注意到WhatsApp Messenger通知提出类似于Facebook Messenger通知如何交付 - 带聊天头。这是一个带有Messenger的个人资料图片的圆圈，并单击它打开一个小窗口，其中显示了消息。
After an Android 9.0 Pie update on my Samsung Galaxy Note 8, I have noticed that Whatsapp Messenger notifications come up similar to how Facebook Messenger notifications are delivered - with a chat head. This is a circle with the messenger's profile picture showing, and clicking on it opens a small window with the message shown.
I preferred when this chat head was never there, and I got to see a preview of the message for a few seconds just below the top of the screen when a message arrives.
I have tried turning off pop-up notifications on WhatsApp, but this seems to be something different entirely, as the chat heads continue to come up.
Is it possible to turn this feature off?
Follow this path to enable or disable the mentioned "chat heads":
Settings > Advanced features > Smart pop-up view
Then, toggle whatever applications you'd like to show "chat heads".
WhatsApp does not naively support chat heads. So, this is being done by using a third party app. Probably you installed one, or in a rare case your phone manufacturer baked such a thing into the phone UI. Please look into your device settings and also go through your installed apps if you notice something.