New text messages no longer pop up at the top of the screen. How do I set this up?

SMS reminders no longer pop up at the top of the screen. How do I set this up? It seems that you need to go into the information to set it up, and then set it to the front of the phone, or the screen needs to be set to go to get it. If you don't do it, it will usually not be displayed. , will also tell you that if you set it up at this time, your information cannot be trusted. Only such letter information will pop up. Or is it really an editorial that Hongshan doesn’t dare to read anymore and he will jump to tell you the letter information?