Default value: Automatic (based on current localization)
This option allows you to choose up to three countries to show holidays for.
Using a column as the countries
If you want to show holidays for more than three countries or you want to set the countries dynamically, you can use the Holidays Countries field well.
The measures bound there must contain the ISO of the countries you want the holidays to be shown.
When you use this method, the countries set in the Countries options are ignored.