You can manually input any volume you want, starting from 0.01 Lots and with the incremental step of 0.01 Lots. For example, you can input "0.12" or "0.03", which solves the possible problem without answering the question.
In order to see the full list of available instruments, please select the "Show All Symbols" option from the right-click menu in the "Market Watch" window. It is recommended to repeat this procedure at least once a month, because new contracts are added regularly and some expired contracts (i.e. futures) are removed from the list.
Deposit/Withdraw with zero commission