When accepting payments through the Stripe integration, the currency use is pulled directly from your Stripe account. Upon connecting, we ask Stripe what currency your account is using and apply that throughout your Start Booking account.
To change your account currency, contact support and let us know what currency you would like your account updated to use. One thing to note, your Start Booking account and Stripe need to use the same currency.
Talk to the support team to ask additional questions.