If this should be your default money representation then you can adjust (or add) the moneyFormat variable in your application. Maybe like this:
Set MoneyFormat='$ #,##0.00; ($ #,##0.00)';
Then just wrap your measure with a money format like this: money(<Your KPI expression>).
If you do not want to edit the MoneyFormat variable then you need to set the format manually like this.
money(<Your KPI expression>,'$ #,##0.00; ($ #,##0.00)')
