Try it without the columns environment in your document, i.e. \startchapter[title=\mytitle{Register}] \placeregister[index] \stopchapter Hans van der Meer schrieb am 26.08.18 um 17:48:
Could the following setup I used be the culprit?
\setupregister[index][pagestyle=slanted,textstyle=small,alternative=A]
On 26 Aug 2018, at 17:43, Wolfgang Schuster
mailto:wolfgang.schuster.lists@gmail.com> wrote: The real question is why do you get an index without two columns.
\starttext
\dorecurse{26}{\convertnumber{a}{#1}\expanded{\index{\convertnumber{a}{#1}}}}
\placeregister[index]%[n=3]
\stoptext
Hans van der Meer schrieb am 26.08.18 um 17:37:
How do I produce an index with more than one column?
This produces one column only: \startchapter[title=\mytitle{Register}] \startcolumns[n=2] \placeregister[index] \stopcolumns
Nor did \placeregister[index][n=2] or \placeindex[n=2], with or without the columns envirenment, produce the result wanted. The \startsimplecolumns[n=2] environment did produce two columns, but then played havoc with the textheight.
dr. Hans van der Meer
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met vriendelijke groet dr. Hans van der Meer