How can I retreive a lesson that i have deleted accidentally?

So, I see this has been a problem in Rise for years. That's unfortunate. It would seem to me that having an undo button SOMEWHERE in the software would be most beneficial for users - and not a notification for 12 seconds! I never even got notified when my lesson deleted off my screen. I swear I hit edit, not delete, and just lost an entire lesson. Having to constantly duplicate your courses every time you need to edit them is not a good solution.