From the iPhone web app when connected remotely (outside my network), under Settings you can currently uncheck the Remote Access feature. You should not be allowed to disable this feature unless you’re connected locally to the Tablo. This is how the iPad app works, I am assume it’s just a bug in the new release of the web apps.
The problem it creates is if you disable the Remote Access when away from home you will not be able to connect to the Tablo and reconfigure the remote access until you return home.