@Aleksej thanks for letting me know about the missing links. I created a support thread for as I haven’t had time to update the repo yet. But you can also use the old repo if you want - I will transfer all issues related to the add-on to its own repo in the future.
Why does it turn off when returning to the deck list?
Pretty much just replicating the behavior of the add-on it’s based on, Card Info During Review. Do you have a particular use case in mind where keeping the sidebar open would be helpful? My line of thinking would be that this is a UI that’s contextual to the Reviewer, so it seems sensible to exit it when also exiting the Reviewer.