Is it possible to change the currency format to European standards?

For example, I would like to show the output as 123.456.789,32 rather than 123,456,789.32.

Yes, this setting can be configured by going to Administration > Admin Console > Configuration > Regional Settings. Under Text format, there is the option to switch the separators for decimals and thousands.

You can also opt to add prefixes (eg. $) to fields in reports using Column Formatting.

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