Groups created on the LG smartphone can be deleted, but members (contacts) are not deleted, only removed from the group. Note: The default groups Family, Friends, Colleagues and Emergency Contacts cannot be deleted.
Android 9 | LG UX 9.0
Step 1:  Open the  Contacts -App
Step 2:  Tap on  Groups
Step 3:  Tap on desired  Group
Step 4:  Open the  Menu
Step 5:  Tap on  Delete group
Step 6:  Tap on  Delete
  1. Open the Contacts-App
  2. Tap on Groups
  3. Tap on desired Group
  4. Open the Menu
  5. Tap on Delete group
  6. Tap on Delete

LG Instructions