Most campground in bear country are segregated by the term "hard side only". Those are the ones that are a problem with pop-up, hybrids, and tents. If possible just camp with the walls closed and it's a "hard side". Otherwise just look for campground that are "safe" for pop-ups.
Now that doesn't mean there aren't going to be warnings. What the others have said above applies. Keeping food and other good smelling things locked up is important. The idea is that it'll keep the bears out of the campground to keep it as pop-up/hybrid safe campground.