How to change heading style numbering format in MS Word?

I see style numbering is not reflected in numbering setup window. Is this a bug? How to change numbering?

enter image description here


Solution 1:

If you are changing any of the characteristics of a multilevel list (which you probably are, in this case), don't go through the Style->Format->Numbering dialog. Go through the Multilevel list dialog on the Home tab of the Ribbon.

Personally, I still find this entire process exasperating so cannot really offer much more help than that, but you may find the late Shauna Kelly's page on the subject useful