I tried to collapes the screen by pulling the thing onto the new screen. However, it isn't doing anything? I don't know why not. I also can't open the properties tab. When I push "n" it doesn't open the right tab. (I want to open the particles tab)
When selecting the 3 diagonal lines, make sure your cursor is a cross hair and not arrows. you should see the screen turn gray and an arrow appear and that is when you should let go of the mouse.
To open the properties tab, make sure that your cursor is in the panel before pressing n.