Layout grid columns for a different default device

Hey,

When i'm working in Mendix I work with the styling and layouts, I would like to see an option for a default device for the layout grids.

If we are building a mobile app, i would like to see that the column widths in the layout grid would be for mobile.
So that the HTML classes that come with the column numbers will be col-xs-# instead of col-md-# (for tablet offcourse col-sm-#)

I added a screenshot for an idea where to put the configuration option. Maybe you could even control more options and configurations to this checkbox