Yes! If a room on the bed board is not being used for patients (for example, it is currently out of use or being used for another purpose), you can hide it from the bed board.
Click the hidden-eye icon and this room will be removed from the board. Doing so will remove the board from capacity views and bed counts.

To unhide a room, you can click the eye symbol again and the room will be restored to bed board capacity and census bed counts.