Sorry for the English error BTW. I just remembered, the default setup has the frame bar. Since that isn't present either, you must have did "SHIFT+Space_Bar" which makes a screen occupy the whole area. Press it again to go back to normal.
This and the above functions are worthy to memorize BTW.
Thank you very much!! You just saved my life, and it's very helpful for me to know. I downloaded a lot of .blend files but I can't modify them much since they mostly hide the toolbar or whatever it's called --- Official PC Master Race representative of NDF