The default calendar displayed on the OnePlus smartphone can be expanded by selecting an alternative calendar, for which we have the following options that can be activated with a tap of a finger:

Android 10 | OxygenOS 10.0
Alternate calendar -  Open the  Calendar app
Alternate calendar -  Open the  menu
Alternate calendar -  Open the  Settings
Alternate calendar -  Tap on  General
Alternate calendar -  Tap on  Alternate calendar
Alternate calendar -  Choose an  alternate calendar
  1. Open the Calendar app
  2. Open the menu
  3. Open the Settings
  4. Tap on General
  5. Tap on Alternate calendar
  6. Choose an alternate calendar

OnePlus Instructions
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