I read in the docs:
"There are times when you need to have a block next to a block. Perhaps you want to have a survey inline with your content block. Perhaps you're trying to put headshots next to bio-blurbs and you don't want to use a table in the content editor. Add a layout to your block area to turn a single block area into many:

The layouts tool from the block area will divide the area into as many parts as you want and give you draggable sliders to control the positioning. "

I would like to try this out as an alternative to creating a lot of different theme pages, but I can't figure out how to use it. I added some content areas to the main block of the page, but I can't figure out how to either add a layout to the block area, or see the layouts tool. thanks.