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To change the font for all the headers and footers, in your customization CSS, add a CSS rule similar to this:

@page {
    font-size: 12pt;
    font-family: "Arial";
}
Important: These settings apply to all page margin boxes, but not to the text inside the page.

If you want to change the settings only for a specific page type (for example, the table of contents), use the name of the page:

@page table-of-contents {
    font-size: 12pt;
    font-family: "Arial";
}