Money 4 allows you to manage accounts in different currencies and track exchange rates automatically. Money automatically sets the default account currency to match the one you have specified in Preferences > Currency. However, you can select one of the operational currencies to be used with a particular account.
In the Library, each account shows its balance in its own currency. In the Overview, the Accounts summary table displays the balance in both account currencies and the default currency (based on Money's current exchange rates).