When creating a group on the Xiaomi smartphone, we immediately assign a name to it. If we want to change or edit it afterwards, we can do so at any time. The default groups, such as family, colleagues or friends cannot be renamed.

Android 10 (MIUI 12.0)
Step 1:  Open the  Contacts app
Step 2:  Tap on  My groups
Step 3:  Select a  group
Step 4:  Tap on  Rename
Step 5:  Enter a  name  and tap  OK
  1. Open the Contacts app
  2. Tap on My groups
  3. Select a group
  4. Tap on Rename
  5. Enter a name and tap OK

Xiaomi Instructions