The Data Explorer now has the ability to show your data in its original currency. This is particularly useful if you're exporting the data and want to apply your own conversion rates after the export. To enable this, select "Original currency" in the Data Explorer's currency tab.
When you select this option, the Currency dimension will be automatically added to your Data Explorer table and will display the currency that applies to each row of data.
It's worth noting that when viewing data in original currency, the topmost "grand total" row in Data Explorer will sum the values and thus display a total which is calculated from mixed currencies.
Using currency conversion works just like earlier, but you'll now be able to see the currency used above the Data Explorer table, or by using the Currency dimension.