If desired, incoming calls on the LG smartphone can be automatically answered after one, three or five seconds.

Note: A hands-free device must be connected for calls to be answered automatically.

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  Answer and end calls
Step 5:  Tap on  Auto answer
Step 6:  Choose between  Off,   1 sec ,  2 sec  and  5 sec
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Call settings
  4. Tap on Answer and end calls
  5. Tap on Auto answer
  6. Choose between Off, 1 sec, 2 sec and 5 sec

LG Instructions