To take money out of an investment account, transfer it back to your wallet (or another account) from the Transfers page.
Open Transfers
Select Transfers in the sidebar.
Source is the investment account
Set the investment account as the source.
Choose a destination and amount
Pick where the money goes and how much, then confirm.
Mind the minimum balance
If a master sets a minimum deposit, your investment account must stay at or above it to keep the subscription. Withdrawing below the minimum can end the subscription.
