Will we be able to review lessons already learned like we were able to formerly?
No you cannot with the crown system. The only way to see the older version of Duolingo is to download and instal the windows desktop software where you still see all the individual lessons split up into boxes. I made jpeg images of them a while ago and shared a link to them.
Hi, this is the Italian forum, for getting help with Italian grammar, vocabulary, resources, etc. Could you please edit your original post and use the drop-down list at top left to change the topic from "Italian" to "Troubleshooting"? That way it won't clutter up the Italian forum, and the answers you get might help others who look in Troubleshooting for information on how Duolingo works.