When you receive unwanted notifications from an app, touch & hold the notification, then tap Turn off notifications.
To review all apps and adjust whether they can send notifications:
Do one of the following:




If you want an app's notifications to be less intrusive, you can categorize them:
Option 1: On a notification
Option 2: In Settings
Go to Settings > Sound > Do Not Disturb.
Or, in quick settings, touch & hold 
Select what to allow or block:
To hide the icons for silent notifications from all apps:

Restart the phone to apply the new settings.
You won't see the icon in the status bar for any silent notifications. When you swipe the status bar down, the icon appears in the pull-down along with the notification.
To adjust the volume level of all notifications:

You can modify the notification sound for all apps, or assign a distinctive sound to notifications from a specific app, replacing the default.
Do one of the following:

Tap the category for enabled notifications, then tap Sound and select a unique ringtone, or set it to none.
If an app's notifications are silent but you want to hear them:
To let an app's notifications be heard when Do Not Disturb is on:


If an app isn't sending notifications but you want it to:


If you want to be able to snooze your notifications, turn on snoozing:

App icons show dots to alert you about unread notifications. You can turn off dots for one or all apps.






Bubbles keep your conversations accessible by floating on top of other apps. Read and send messages from the bubble without opening the app. You can turn bubbles off if you want to always see conversations in their full app.


Tap Notifications > Additional settings in the app > Bubbles.
If you don’t see Bubbles, then the app doesn’t support this feature.
If you've set a pattern, PIN or password, you can control which type of notifications show on your lock screen and prevent them from revealing private information.
To adjust notifications for all apps:
To hide sensitive content on your lock screen, turn Sensitive notifications off 
You’ll get lock screen notifications for an incoming email or chat, but they won’t include message details.
For finer control, leave this on 
To hide sensitive content from specific apps:

Types of notifications the app sends appear here. For each enabled notification that you want to hide: