As an admin, you can select your company's default currency. To do so, follow the steps below:
Step 1: Navigate to the "Admin" tab on the navigation panel. Under "Company," click on "Settings."
Step 2: From the settings tab, click into the "Currency" drop down box and choose the currency that you would like all money amounts to be displayed in for the company and save.
Please note: If your company has not explicitly set a currency, the default will be based on your browser locale.