I modified it, but it only affects the first page.
The mark appears on the edge of the page; I just want a line in the middle.
\setuppapersize[A5][A4,landscape]
\setuparranging[2*2]
\setuplayout[middle]
\startuniqueMPgraphic{MPfoldmark}
pickup pensquare scaled 0.5pt ;
drawoptions(dashed evenly withcolor "registration") ;
xd := OverlayWidth/2;
draw (xd,0)--(xd,\pagecutmarklength);
draw (xd,OverlayHeight)--(xd,(OverlayHeight - \pagecutmarklength));
\stopuniqueMPgraphic
\defineoverlay[foldmark][\uniqueMPgraphic{MPfoldmark}]
\definelayer[PagePlus][
x=-\pagecutmarklength,
y=-\pagecutmarklength,
width=1\paperwidth+2\pagecutmarklength,
height=1\paperheight+2\pagecutmarklength,
]
\setupbackgrounds[page][background=PagePlus]
\setlayerframed[PagePlus][
y=-\measure{Trim},
x=0mm,
height=1\paperheight,
width=1\paperwidth,
background=foldmark,
]{}
\starttext
\dorecurse{100}{\input knuth \relax}
\stoptext
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