Use the Cash Book settings to choose your default bank account.
You can set the base currency bank account you use most frequently as your Default Bank Account.
Each time a you enter a transaction, this default bank account is always displayed for you. You can change this when you enter the transaction.
The first base currency bank account you create in the Cash Book is automatically assigned as the Default Bank Account. As more bank accounts are created, use this setting to assign a more appropriate Default Bank Account, if required.
You must have:
Open: Cash Book > Utilities > Cash Book Settings.
Open: Cash Book > Utilities > View Cash Book Settings.