How can I disable undo when playing bots?

I've noticed some changes in the bot‑playing controls and I'm still trying to figure out the new layout. I used to play in what I think was called “Challenge Mode,” where takebacks weren’t allowed. You could click the back button to review earlier moves, but if you tried to enter a different move than the one you originally played, the board would snap back to the current position.
Is there a way to get that mode back under the new interface, and if so, how?

You can't as far as I'm aware on the update.

There may be some changes coming to the available options though

Thank you for your reply, but this change, in my opinion, is a step backwards. Re-dos are not allowed in real chess. I used to use them when I was a beginner to chess against the computer, but when I started playing against people on chess.com I disabled them to better simulate real play. I know I can just not use undo, but it was nice quick way to check what piece got captured on the last move if I wasn't paying close enough attention. Now if you hit the back button the computer will randomly make another next move, changing the game entirely.