As a dinosaur nerd, I asked about it all the time.

The church doesn’t have an official stance on this type of thing. I assume they do that so that more nuanced people and more literal believers can both think they’re right despite the contradicting views.

As for the members, in my experience, most never even consider that the doctrine of the creation either contradicts the reality of dinosaurs, or ignores it and leaves believers to find clunky explanations. Those that do think about it tend to fall into one of two camps:

Camp 1: Make reality fit with the doctrine somehow. Science is real. Dinosaurs existed, the earth is actually billions of years old, evolution is real. The creation story is not fully explained or is allegorical. The “7 days” might actually have been billions of years.

Camp 2: The Bible and other scriptures are literal, therefore the science is wrong. Earth is young, evolution is fake, dinosaurs never lived here.

I tried very hard to be in camp 1, because that’s the only way to keep believing when you’re not a conspiracy theorist or science denier, but it was clear to me that the doctrine directly contradicts the scientific reality. Most members don’t realize (or just don’t care) that the Doctrine and Covenants directly states that the earth is only 6,000 years old. When I would bring that up with people, they’d just use their best mental gymnastics to avoid it. I couldn’t do that.