On LG smartphones, you can prioritize notifications from an app. Under the Importance option, you can set the app's notifications as Urgent, High, Medium, or Low. Depending on the level, visual and/or acoustic interruptions are generated.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Apps & notifications
Step 4:  Tap on  App info
Step 5:  Tap on desired  App
Step 6:  Tap on  App notifications
Step 7:  Tap on a  Category   
Step 8:  Tap on  Importance
Step 9:  Choose between  Urgent ,  High ,  Medium  and  Low
  1. Open the Settings
  2. Tap on General
  3. Tap on Apps & notifications
  4. Tap on App info
  5. Tap on desired App
  6. Tap on App notifications
  7. Tap on a Category  
  8. Tap on Importance
  9. Choose between Urgent, High, Medium and Low

LG Instructions