You can click on the notation to see previous moves, as I have discovered when facing the same issue. However, I preferred the back/next arrows to review the past few moves, and also not having the opportunity to takeback.
How to play without undo in challenge mode
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I've been playing here for a while. I really like to play against the bots (it's almost the only thing I play), but suddenly, when I play against any bot in challenge mode, it lets me undo moves for some reason, and I don't want to. I liked to see the previous moves while I was playing, but now I can't because it just undoes the moves xd