Members from a contact group can be removed quickly and easily using the group's edit mode.

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  Edit group
Step 6:  Tap on  Remove  the desired  member
Step 7:  Tap on  Save
  1. Open the Contacts-App
  2. Tap on Groups
  3. Tap on desired Group
  4. Open the Menu
  5. Tap on Edit group
  6. Tap on Remove the desired member
  7. Tap on Save

LG Instructions