The swinging door opens both ways (in and out), and uses a special "hinge" mechanism that mounts on the floor (and the top jamb). You can get any slab or lighted door that will fit the entrance. You didn't mention whether you wanted the door there to simply hide looking through, or for weather stopping. You won't get a great seal with this door, but it will work great. I'll try to attach a picture of ours, between the kitchen and dining room if you'd like.
I see Daryl shows the hardware. But our door isn't a bi-fold. It's a 3 over 5 lite French door with a natural finish. Looks great!