You'll want to turn on the multicurrency. This feature will give you an option to set the Euro as the home currency. However, that affects all your accounts, not just the deposit account, and we can't undo nor turn it off.
Also, this feature allows you to add an account that uses a foreign currency. For example, your home currency is Pound but you want to set up an account for Euro.
These are the steps on how to turn it on:
Go to the Gear icon and select Account and Settings.
From the Advanced, select the Currency section and choose your Home Currency.
Select the Multicurrency checkbox and confirm that you understand that you can't undo this option.