All aggregated numbers on the Dashboard and Accounts & Transactions are converted to a baseline currency. By default this baseline currency is set to your home currency.
You can change the baseline currency by clicking the settings icon Dashboard settings or Account settings in the upper right corner of Dashboard or Account overview. This will bring you to the settings for Dashboard and Accounts & Transactions. .
In the Baseline currency section, you can change the baseline currency to any of the other currencies that you have accounts in. After the change, all aggregated numbers will be converted to the selected currency.