If you are currently using an app on your LG smartphone, an incoming call will display a pop-up window that will pop up across the screen, but if you don't want this to happen, you can disable the "Incoming call pop-up".

Android 9 | LG UX 9.0
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Call settings
Step 4:  Tap on  Additional settings
Step 5:  Enable or Disable  Incoming voice call pop-up
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Call settings
  4. Tap on Additional settings
  5. Enable or Disable Incoming voice call pop-up

LG Instructions
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