I deleted some fields from a hosted feature layer that I no longer need. I regularly update this layer by going to Update Data -> Overwrite Entire Layer, and then uploading a new csv file. The new csv files I have been uploading also no longer have the columns that I deleted from the hosted feature layer. However, every time I overwrite the layer, the columns get added back to the feature layer. I delete them again, check back later, fields are still gone, but then every time I overwrite the layer the fields reappear. Is there a way to permanently remove these fields?