This has been discussed in a similar manner on other threads - which seat does the commander sit in?
It really doesn't matter, provided the commander has sufficient sight of instruments and can control the aeroplane fully from that seat.
I have a Citabria which is soloed from the front, however, when I take people up, I usually fly from the rear seat as it gives a much better view etc and I can still do everything from there as that is where the instructor would sit.