i created a new Post typ and a layout. in the layout i have a problem with a grid cell. its shows a minus margin and is lager as the container max width (1200px). I couldn´t finde where the margin in coming from or why the grid cell is that large...
Please check this screenshot hidden link
You can customize the margin/padding of each grid cell block. I wonder if this is what you were looking for, or if I misunderstood your request.
Does customizing the grid cell helps? Or do you get any unexpected results?