Hi,
In the code below, how to make the line hyphenation is in the first column and not in the second.
Thank You.

Fabrice

\setupcolors[state=start]
\definemixedcolumns
  [mycolumn]
  [
    n=2,
    separator=rule,
    rulecolor=gray,
    rulethickness=1pt,
    balance=yes,
  ]
\setuppapersize[A4][A4]

\setuplayout[
        backspace=15mm,
        width=middle,
        topspace=15mm,
        height=middle,
        header=0pt,
        footer=0pt,
            ]
\loadtypescriptfile[mathdesign]
 
\definetypeface [mainface] [rm] [serif] [palatino] [default]
\definetypeface [mainface] [tt] [mono]  [modern] [default] [rscale=0.9]
\definetypeface [mainface] [mm] [math]  [xits] [default]

\setupbodyfont[mainface,11pt]

\starttext
\startmycolumn
\startitemize[n][stopper={)},style=bold]
\item
\startitemize[a][stopper={)},style=bold]
\item
\item 
\item \'Emettre une conjecture sur la nature de la transformation correspondant à l'enchaînement de ces deux translations.
\startframedtext[frame=on,background=color,backgroundcolor=lightgray,width=local]
On notera $\vec{u} + \vec{v}$ les caractéristiques de cette nouvelle transformation.
\stopframedtext
\stopitemize
\column
\item
\startitemize[a][stopper={)},style=bold]
\item
\item
\item
\stopitemize
\item
\startitemize[a][stopper={)},style=bold]
\item
\item
\item
\stopitemize
\stopitemize
\stopmycolumn
\stoptext