If that were the case, then zoos, aquariums, and museums in CA wouldn't have reduced capacity. For example, when we went to the San Diego Zoo in July a week or 2 after it reopened, there was reduced capacity. It was first come, first served. They counted how many people entered. And if they reached capacity, then you'd have to wait for others to leave before you could go in. All of the popular animal exhibits (the orangutans and gorillas, for example) had markers on the ground where you & your family group were to stand and it was far apart from other ground markers.
At the Bowers Museum, for example, which right now has a Disney Archives exhibit, you have to select an entry time.