I saw the La Jolla production. The choir sat in groups of three or four at the rear of the stage in elevated rows. Depending on the lighting, they were visible but not in the spotlight except as I recall for the Entre'acte, which was a sung (in Latin, or was it French?) pastiche of several of the songs. Really beautiful. I was remembering though how silently and motionless they all sat there for the entire performance, dressed in grey robes and very much resembling statues in the cathedral. No shifting in their seats, no sips of water, etc., only slight raising of their choirbooks. Of course, I wasn't watching them full-time, but it was amazing to me their ability to be so still for both acts.
Yes, the show had its issues which were discussed here in detail. But overall I was delighted to see one of my favorite Disney scores finally on stage. (I kept trying to get to Berlin to see the original but that dream stayed 'out there.'