Oppo
Show or Hide Holidays in Calendar auf Oppo
The Calendar app on Oppo phones running ColorOS pulls holiday entries from your connected Google account. The region stored in that account acts as the data source, so the same phone can show different holidays depending on which account is signed in.
This is why holidays sometimes appear that do not match your actual country, or why they disappear after switching accounts. The setting itself does not filter by country, it simply switches the whole holiday layer on or off.
To change it, open the Calendar app and tap on Tap on Calendar. From there, go to Open the Menu and use Enable or disable Holidays to turn the display on or off.
Turning holidays off removes them only from the calendar view. It does not delete any of your own events, reminders, or appointments.
If holidays still show the wrong country after toggling, the issue usually sits in the Google account region setting rather than in the Calendar app itself. In that case, checking the account region is the better fix than repeating the toggle.