I have a few favorite designs for foldables. I love a door foldable and I love a tabbed foldable. Both of these are just great ways to organize multiple pieces of information about one topic. For my foldable on graphing quadratics, I used a 3-door foldable, but had the doors fold down. I left a little area at the top for a title, so that they don't fold the paper directly in half. By this time of the school year, my students are so used to my foldables, I don't even have to tell them what to do! :)
In the picture below, I define parabola as the shape of a quadratic but when I taught it, I didn't like it and changed it to the graph of a quadratic....which do you think is preferable?