Obstructed office windows

Hey, here's a question for those of us who know a bit more about office process than I; the back room offices with windows built into the doors... are management allowed onto block those windows when in there? Because it seems to me that those windows are there for accountability reasons, you know? Prevent shady shit, or whatever. If anyone knows, and knows the relevant location in process guides that I can find and screenshot, let me know.