What is the DX8 hidden region?
The DX8 hidden region, is a region that blocks can be placed in, and allow blocks to be selectable within the DX8 block element.
DX8 hidden region is a Drupal region that is included with the DX8 minimal theme. This region is not rendered out on the front-end and can be useful for placing blocks that you want to be able to select within the block element.