Setting font for page number changes font for that page number only and not all page nos of section

[Swarup]

When I go to the first page of a section, highlight the page number in the footer, and change its font, this action changes the font of that page's page number only and not all the page numbers in that section. I tried going into styles, selecting "page number", and setting the font there to Nirmal with size 8, but it did not bring about any change. There must be a place to set the font type and size for all the page numbers of a section, or preferably all the page numbers of a document.