You can see what and when capacities were changed. But you cannot see by whom. I have suggested this be provided, but the powers that be could not understand the use case for providing that info. I won't link you to my card that provides this info, but I will let you know the name of the dataset that contains the info. It'll be on you to dig a little deeper.
Code:
StoresSalesFloor.store_planogram_item_capacity_snapshot