Go to [Settings]-[Apps & notifications], you can complete setting of the following permissions:
Screenlock display: Set how to notify users when the screen is locked. Options include displaying important notices and unimportant notices, only displaying important notices, or displaying no notices. On the app screen, select the app notices to be considered important or unimportant. You can also set whether to display sensitive messages.
Permitted to use the [Allow notification dots]: By enabling this feature, you can use the dot to notify users. If a new message is received, a blue dot will pop up in front of the app.
Do Not Disturb: Set how to present notices and exceptions in [Do Not Disturb] mode. For more notification methods about specific apps, tap [Settings]-[Apps & notifications], and then select specific apps to adjust their settings.