I had a 1996 Buick Riviera before and I swear it had a feature where you could set the the interior lights to slowly dim after the doors were closed. I think they called it "opera lighting". I don't remember how it was set. I now have a 1995 Riviera and see no such operation. Was there such a thing?
A lot of cars have it. My '96 Bonnie has it, and I believe it's called 'theater lighting' or something. Anyhow, it's not a switch on my car. That's just how the lights go off. Maybe the feature didn't start on the Riviera's until '96, like your last car.
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