If I understood you well you want to know which balance will be chosen if you spend money.
There is in FAQ:
What balance will my Revolut card use when I am abroad?
Your Revolut account can hold a balance in GBP, EUR, USD, PLN, CHF, SEK, NOK, DKK, RON, AUD, NZD, SGD, HKD, ILS, TRY, AED, CAD, HUF, INR, JPY, MAD, QAR, THB, and ZAR. The card selects which balance to use in the following order:
*The local currency of the merchant/ATM e.g. if you are in Spain, it will deduct funds from your Euro balance.
*Your base currency - i.e. if you used a UK address to sign-up, your base currency will be GBP.
*Your largest balance.
You need to have sufficient funds in one single balance in order to make a transaction. If you don’t have enough funds in the balance of the local currency, it will default to your next largest balance and so on.