At any time if you ever need to change the currency of your expense reports, you can do so through the Convert Currency menu option, by going to the View Tasks navigation menu from the left side of your screen.
Click on Convert Currency and the currency selection screen will open with all the available currency options:
On the top of the list, you will see the current currency that you have set for your organization and/user account.
To modify it, click on any of the options provided in the list and the system will promptly update the currency across all the expenses and expense reports. You can immediately see the update on the Expense Reports and Expenses totals columns.
Additionally, you can see the updated currency in the navigation menu, which will now display Converted to XXX(selected currency).
Note: Once you refresh the webpage, this menu will go back to Currency Converter label.