The amount that you have not yet invested remains in your Cash wallet. This is your total CASH.
When you don't have any positions open, your total CASH and your total account value are the same.
When you open positions, we lock part of your total CASH to pay for closing fees and - if you use the Multiplier feature - financing fees. This is what we call the 'ring fenced' amount" (see: What is the ring fenced amount?).
The rest of your CASH is available for trading or withdrawal (see: Depositing and withdrawing with BUX X).
When you close all your positions, no amount is ring fenced and you can withdraw your total CASH.
Questions? Yell out at BUX X Support.