Hello aglfern
Click the "Automation" button on your country page.
You should be taken to a page called "Country Automation".
On this page there are a series of check boxes that can be checked or unchecked. A tick means the Automation in that area is Active, an unchecked box, means that Automation is disabled.
There is a box called "Buy and Sell shares for your investment fund automatically" Un-tick that box.
Remember to press the "Save Automation Features" button, at the bottom of the list, before leaving the page, so that your changes take effect.
You will now have full manual control of your Investment Fund, the Automation should no longer buy or sell Shares in your national Investment Fund.