The Auto-Submit function is used for retrieving fetched documents. This can be switched off in much the same way as it is switched on.
To do so, navigate to File Management > Root Folder > Document Fetching > Suppliers/Banks. Here, click on the Auto-Submit button, under the Action.
The following window will be brought up. All you need to do here is un-tick the box beside "Auto-Submit" and then click Save.