It’s obvious that one should click the “Withdraw” button for funds withdrawal. After that, an incomplete withdrawal operation will appear in the transaction history.
You can cancel the withdrawal while it has not been completed. You can do it by clicking on the operation; this will open a pop-up window with detailed information and the “Cancel the withdrawal” button.
Please note that it takes 48 hours to withdraw funds, but this withdrawal delay can be disabled (read more here).