Hi - I have a United itinerary with Eurowings and Germanwings legs. United shows I have seat assignments for both those flights, but no apparent way to change them. When I go to Eurowings website i can access booking but I loop through seat selection back to reservation. Flight is in about a month.

Any way to do this? Main thing is one leg my companion and I aren't seated together, while I'd prefer we are. (Yes, I can survive being seated separately for a couple of hours, but why if avoidable?)