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The calendar on the Samsung device usually shows all accounts that have been logged in, and the following calendar/accounts are available by default

The accounts cannot be completely removed from the calendar, they can only be hidden.

Android 11 | One UI 3.0
Step 1: Tap on  Calendar
Step 2: Open the  Menu
Step 3: Choose an  Account
Step 4: Show/Hide the  Account
  1. Tap on Calendar
  2. Open the Menu
  3. Choose an Account
  4. Show/Hide the Account
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Samsung Instructions