Hans Hagen schrieb am 02.08.2019 um 23:10:
On 8/2/2019 10:26 PM, Alan Braslau wrote:

\setupheader [lefttext=,leftoddtext=,middletext=,...]

This would be logical.
we have a lot or areas ... and if you really want you can do this ...

\setuplayouttext
  [header][text]
  [lefttext=L,
   middletext=M,
   righttext=\doifoddpageelse{RO}{RE}]

\setuplayouttext
  [footer][text]
  [lefttext=L,
   middletext=M,
   righttext=\doifoddpageelse{RO}{RE}]

\setuppagenumbering
  [alternative=doublesided]

\starttext
   test \page test \page test
\stoptext

Has been there for ages ... (but I never use that method).
I has the same question a few years ago but I never used it
because it has a few limitations like missing style/color support.

\setuplayouttext[header][text][lefttext=L,middletext=M,righttext=R]

%\setupheadertexts[M]
%\setupheadertexts[L][R]

\setupheader
  [color=red,style=bold]

\setuppagenumbering
  [alternative=doublesided]

\starttext
\dorecurse{2}{\page[dummy]}
\stoptext

Wolfgang