Trader Workstation TWS Basics - Currency Conversion and Currency Trading (8)
You can not change a base currency of your Live Account.
If you like to have a live account in another currency, please open an additional account with your preferred currency.
You can have up to 10 live accounts at the same time with any account types and account currencies.
*If you already have 10 live accounts, then you may close some to open more additional accounts.
Fees of exchanging currencies
XM does not charge any for converting a currency to another.
The broker may simply convert the amount according to the daily rate of their banks.
For example, if you make a deposit fund in EUR to an account in USD, then the XM will credit the fund into the account in USD rate of the day.
XM Official Website