Many beekeepers begin spring by “reversing brood boxes,” which just means switching the two so that the cluster is on the bottom. Some beekeepers do this routinely, while some never do it. It’s not necessary because, as the brood nest expands, the queen will eventually begin laying in the bottom box, especially if you use a queen excluder to keep the queen out of the honey supers. Whether you reverse the boxes is just a matter of beekeeper preference.