nonancora

Sorry, I need help. In the old version of BBO, during my lessons I used the "UNDO" button very often and very quickly I could go back into the game. With the new "undo" version it is hidden and its use is very slow (I can go back only a few times so as not to bore students). Is there a quick way to go back that I can't understand? I do not believe. So why was this element made worse in the new version of the program? If you ask a teacher, he will tell you, as I am telling you, that during a lesson this key, this command is used a lot, it is fundamental for the dynamics of the lesson. Thank you very much. Regards, Bob