For full width fabrics, fold in half, the ruler fold, then fold in half again. The final fold will be on the 6" side, so you can do narrow stacks that are about 10" deep. Less wasted space behind the stacks this way.
I prefer them standing up though. No boards because they waste space. Fold in half, then in half again. Then ruler fold. Stand up, 10" tall and 6" deep, with fold out. It takes up more space than the first method, but it stays neater for me.
Eta: this link is really great and uses boards.
http://cuttopieces.blogspot.com/2011...-tutorial.html