Thank you, Wolfgang. 

Marcus Vinicius 

On Fri, Feb 8, 2019, 14:53 Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> wrote:
Marcus Vinicius Mesquita schrieb am 08.02.19 um 17:47:
> Dear list,
>
> When processing the attached mwe:
>
> \setuplayout[grid=yes]
> \showgrid
> \setupcolumns[n=2]
>
> \starttext
>
> \startcolumns
> \input knuth
> \column
> \input knuth
> \stopcolumns
>
> \stoptext
>
> in the final result there is a background color.
> How do I get rid of it?

\showgrid[reset,bottom,all,right]

Wolfgang