<context source="yes">
\usesymbols[nav,cc]
\setupalign[flushleft]
\startcolumns
\stopcolumns
\startalignment[flushleft]
The default \type{nextpage} symbol: \symbol[nextpage]
The new default \type{nextpage} symbol: \symbol[navigation 2][nextpage]
\stopalignment
</context>