I think you are because I think I have controlled it somewhere in the past.
My first thought was the custom settings would restrict the TOC but it doesn't.
Then I thought I will edit the heading styles in Word but there are no TOC options.
The I asked Word help and found "Format or customize a table of contents". You will find the instructions there. You need to customise the TOC and then I think you can save it in a Word template. Use this template for your next Word export.
There is a method in MindManager and that is to put the content you don't want in the TOC in topic notes. Which is how I have done it in the past.
My process for writing a document is:
- Brainstorm topics
- Structure topics
- Add content to notes (this may include moving topics into notes).
This is the only option if you really want to go down to eight heading levels while the TOC goes down to four. If however you really want only four heading levels you could follow Andrew's suggestion to move the other topc levels into topic notes, or you can can use the Word template tab in the Microsoft Word Export Settings to apply other on-heading styles to topic levels five to eight.
Bear in mind that MindManager actually creates its own version of the template with its own version of the Word styles commencing with MM, EPeg, "MM Topic 1" instead of "Heading 1", which can be confusing later if you try to add material later to the document using Word heading styles. If you really want to control the whole process have a look at the WordX add-in which gives you much greater flexibility in applying Word styles and therefore determining which TOC level is applied.