On your Hive Markets account, click on My Accounts.
Open the Investor's Account by clicking on the Gear Icon.
Select the Fund that you would like to proceed with.
Click on the expand menu option (shown as: ...) and select Close Account.
Click on the Close Account button.
At this point, a withdrawal request is created which would need to be approved by the Money Manager within 1 week. If not addressed within the timeframe, it will be automatically approved and sent to your Investor account.