I rearranged my horizontal boxes today.
The first frame, where the entrance is, I placed a pollen frame. Then I alternated 1 empty frame, 2 brood frames, 1 empty, 2 brood, until I consolidated all the brood to the front of the hive.
After opening up the brood nest that way, I did the same 1 to 2 alternation with empty frames and nectar/honey frames.
Hopefully this practice will stop the swarming behavior.
There were plenty of bees to cover the brood frames to keep them warm.