Open SW Pillar Section, set the secondary column to Image, and turn on Image as Background. That makes the image cover the media column on tablet and desktop.
To make the SW Pillar Section image fill the whole media column, open the module and use the Image as Background option for the secondary image column. This switches the image from a normal inline image to a full-bleed background inside the media column on tablet and desktop.
The module also includes background position controls so the crop can be adjusted. The same setting may appear under the Style tab when the secondary column is configured as an image.
