I don't know how I got this in my TOC:
The problem is that I get an extra "1" before the word "Inhoud" and also before "1 Foundation 5" and other chapters.
I don't know how to remove this "1". I understand where the other numbers are coming from.
I thought maybe the style of Foundation is based on another style which has also a numbering. But that was not the case.
Ok, I think I understand now.
I wanted to create the numbers in TOC (again so it seems) while it was already handled in my chapters.
Exactly. You can exlude or include chapter numbers.
My problem once was, that the chapter numbering is always like "1. Chapter header" and the TOC would also submit the dot But what in case I didn't want that? What if I wanted to make the level 1 chapters all appear with big numbers in the TOC, without the dot? There the nested styles kick in, which can blank out the dot by making it white, so it does not appear on white background.