They should not be left-aligned by default, since the default TOC field
inserts a right-aligned tab stop at the right margin. If this has become
changed in your TOC, you can modify the tab settings in the relevant TOC
styles.
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Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA http://word.mvps.org
This question is about chapter numbers, which are not automatically right-aligned on the right margin.
I have this same question and have not been able to find an answer that allows me to continue updating the TOC -- all answers I have found require manual formatting.