Not sure my question makes sense, I do not know how to call these dropouts. And I do not know much about Rohloff hubs and chain tension requirements.
My problem : my chain is too loose and fall off regularly. It is not torn, only 1000 km and I checked with the proper tool. But the problem appeared recently : even if it seemed loose to me when I acquired the bike, the chain did not fall off at this time.
I guess these dropouts are made to adjust chain tension, but I tried to unscrew them and they did not seem to want to move much. Since I was not sure, I did not insist.