@podster I don’t use the website any longer, but when I log in to it, it shows me actively adding words from 14 different lists and reviewing words from another 5.
So, on the website, you can set multiple lists into “study” mode, and have as many lists as you like.
Edit: aha, I think you are talking about reviewing a single list (test mode on the new app) versus adding it to your regular daily study queue. In that case, I don’t know what capabilities the web offers.