Might be easy to reverse.
On one side, on the hanger that is attached to the wall, there should be a small plastic insert (1cm by 4mm) that locks the roll in place.
Pull this small insert out.
This then allows the roll to pulled out along a slot from that side. The other end then falls out.
Each end of the roll then has a plastic insert. Pull these both out and reverse them (mine is sware on chain side and round on other).
Slot roll back onto handers. And replace plastic insert to lock roll in place.
Sfk