I thought there should be a setups key on \setupsectionblock, but apparently there isn’t. So, the example below does not work, but maybe it wouldn’t be too hard to add it…
Best,
Denis
\setuphead[chapter][page=yes]
\setupsectionblock[backmatter][setups={\setuphead[chapter][page=no]}]
\starttext
\chapter{One}
\input knuth
\chapter{Two}
\input ward
\startbackmatter
\chapter{Three}
\input knuth
\chapter{Four}
\input ward
\stopbackmatter
\stoptext
Von: Jeroen