Hai, sorry for the late reply, its been a busy month. "In This Story." means that whatever is inside that box, is placed into that story. This is where "Available." comes in - this is where all your story WHICH AREN'T PLACED INTO A STORY GROUP are, so basically, they're just individual. The left/right button is to either place something in a story group, or to take out and make it individual.The up and down button can be used for both boxes but its mainly for the "In This Story" box, you can arrange and order your chapters/work in whatever way you want by pushing it up or down.
I hope that helped! :D
Shh, its a secret
Secret Keeper