How to do Notification Management on Xiaomi Redmi phones

• On your Xiaomi phone, download NiLS from Google Play.
• Launch the NiLS app, and then flip through the Let’s Get Started screens. From these screens, you’ll learn how to enable NiLS to access the notifications (This is necessary) and manage the notifications.
• Click on Open Android Settings.
  
   
• Click on NiLS Service > Enable Accessibility and restart your phone.
  
  
• On the NiLS app, tap  to see the sidebar menu expand from the left, giving you the options such as Global Settings, Notifications Panel, Interaction, Widget Settings, App Specific Settings and etc. Here, you can select App Specific Settings to customize the notifications for each app.
  
  
• Get back to your home screen, find and launch the Setting app. Then, go to Apps > All >NiLSand slide the Show popup windows switch to the right.
  
  
• Now, you should see the new notifications on your lock screen.
  
   
  

Note: The steps here were written for Android 4.2.2 on a Redmi Note (HM NOTE1W). If you’re having a different model of Redmi or other version of MIUI, there’s a possibility that the steps and screenshots will be different.
source