The library function doesn't seem to be configurable.
You can always put 2 of them in your room and remove one of the library functions in each configuration: it will work but will be more annoying if you have constraints on the faces of the library functions in your assembly (or if your library function is at the very beginning of the construction tree).
Hello, I confirm the answer of @froussel , And I still find it a shame especially when constraints are dependent on this function, I find that it limits a little the advantage of the library functions .