I solved this after all, I also noticed that someone else was unable to resolve this on a Microsoft forum, so if you read this, here is my solution:
- Press properties for Heading 1
- Press format, numbering
- Chose No numbering. Exit the properties. All numbering will now disappear.
- From the "start" pane, press multi-level-list, and then the format that looks like:
- Heading 1
1.1. Heading 2
1.1.1. Heading 3