Air Traffic Controller reported the interior working area in the BHM Control Tower has a configuration that blocks the Ground Controller's view of the airport movement areas.

Narrative

BHM Tower has an unsafe configuration. Normal combined positions in the Tower is a LC (Local Control) and the GC/CD/FD (Ground Control/Clearance Delivery/Flight Data). CIC (Controller In Charge) goes to the GC/CD/FD position as well. The CD/FD/GC work from a desk in the middle of the Tower. This desk sits lower than the outer countertops that surround the Tower. It also faces the back of the Tower. While working all of this combined I put the GC/CD/FD Controller in a heads down position. It is not possible to stay looking out the window while working the position including runway crossings and ensuring aircraft are taxiing the right direction. ALL positions in the Tower whether combined or decombined should be in a position to look out the Tower windows. The entire Tower is to work as a team to ensure safety. The current configuration does not allow for that. The Tower needs to be adjusted to ensure all positions face toward the operation. Movement of some equipment would allow us to shift where the Controllers are positioned.