On Mon, 23 Jul 2018, Huseyin Özoguz wrote:

> Dear list,
>
> how can I align the text of the header in the double-page layout to the 
> middle?
>
> I want something like that:
>
> \setupheadertexts
> [{\startalignment[middle] \definedfont[name:Gentium_Basic at 
> 9pt]\getmarking[chapter] \stopalignment}][]
> [][]

\setupheadertexts[chapter]

Aditya