The MWE was really just the only line affecting headers, which you suggested should be written as it is now written below, rather than the way I had it earlier (a leftover from a lack of understanding about font switches which Otared kindly explained to me).

\setupheader [style={\switchtobodyfont[10pt,ss]}]
This proper way of setting out the \setupheader has in fact resolved the situation and it now applies to both recto and verso headers. Thank you
Julian

On 4/9/20 7:16 am, Aditya Mahajan wrote:
On Fri, 4 Sep 2020, jbf wrote:


Thanks Otared. That clears up that little item :-)

BTW I know how to reduce font size in the headers (chapter titles) that 
appear on the recto pages, which I can do with something like 
\setupheader [style={\ss\switchtobodyfont[10pt]}], but it doesn't seem 

Better to use style={\switchtobodyfont[10pt,ss]} or \switchtobodyfont[10pt]\ss...


to affect the header (title of the book) on the verso pages, which is 
drawn from the simple statement:

\startdocument
   [metadata:title={Book title}]

Shouldn't  \setupheader affect both headers? Or is it possible I have 
left something out of my \setupheader declaration?

A minimal example will make the debugging process much easier.

Aditya

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