Guessed
I can not find where you mentioned to it. Where is 'indent' in relevant TOC Style.

There isn't one - you would have to add it. Even then, you'd have to use sufficient negative first-line indent to push the numbers off the page and a large-enough tab-stop to keep the rest of the heading properly aligned within the Table of Contents.

Another approach, which would be a lot more work, would be to break all the numbers and heading text apart into separate pargraphs, using the heading Styles for just the text and creating a different set of Styles with a similar format for the numbers. You could then use Style Separators to combine the numbers & headings in the document body, but only the heading text would appear in the Table of Contents.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]