The total balance and available balance of the selected asset is shown by the account menu on the top right-hand side of the interface. The total balance is the amount available to withdraw plus any balance used as margin for open positions plus the PnL. The available balance is the amount available for withdrawal or to open new positions.
You can click on the account menu to display the balances for each asset (BTC, ETH and USDT) in a sub-account, the total USD equivalent under estimated total and the grand total in USD across all sub-accounts.
Once expanded, the account menu will also display an overview of the sub-accounts and their respective balances for the selected asset:
The sub-account's available balance for the chosen asset is displayed by the margin wheel:
You can also view and manage your balances from the Balances page:
As shown above, by navigating to this page you can transfer funds between sub-accounts, make deposits/withdrawals, or view your available balance, total balance, initial margin, maintenance margin and hold for each asset.