How many drawers should be open on a file cabinet at a time?
Only one drawer should be open on a filing cabinet at a time. If you have more than one drawer open, you won't be able to get to all the drawers. Having all the drawers open can also make the filing cabinet unstable, which can cause it to tip over.
Leave them all closed! Once you file something it's gone into the void...gone forever. =8-0