We can manage the accounts displayed in the Calendar app and enable or disable different accounts for synchronization. By
default, we are shown the phone's account and the Google account selected during initial setup.

Android 10 | EMUI 10.0
Displayed accounts -  Open the  Calendar app
Displayed accounts -  Open the  menu
Displayed accounts -  Tap on  Manage accounts
Displayed accounts -  Enable or disable an  account
  1. Open the Calendar app
  2. Open the menu
  3. Tap on Manage accounts
  4. Enable or disable an account

Huawei Instructions