The grid layout uses the Bootstrap columns to create panes for Dnn. Below is the standard pane layout which is installed with the MDesign theme, these pane layouts can easily be changed by editing an include file in the skin install directory.
We strongly recommend that you copy the '_content-panes.ascx' file and delete the rows and columns that you do not need for your website.
To do this, in the file directory of you site, navigate to:
siteroot / Portals/ {portal directory}/Skins/DnnMDesign/includes
{portal directory} will be '_default' or your portals directory.