Labels by default are formatted with the normal paragraph style. Labels are
tables. You can apply any style you like to the content.
If you are using the envelope/labels dialog, select the label text in the
window and right click - and format the paragraph. Or create a new document
from that dialog and apply a style of your choice to the label text.

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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> I cannot find how to change the format of a Word label from address
> style (left aligned) to 'product style' (centre alignment with
> varying font)