The new feature of organizing saved questions into customizable folders came online a few days ago, and I think it is great. I started a folder of "duplicate targets" for questions that are well, good duplicate target as very similar questions tend to pop up regularly. That list includes canonical questions as well as others.
That being said, I wonder if it were somehow possible to access this list (not this list in particular, but my personally saved list of question) while in the "Close as duplicate" dialogue? It would make the process smoother and faster, as I would not have to open another tab with my list, chose the correct link and paste it into the close dialogue window. As I don't recall the specific phrasing for those questions, it is not that trivial to simply find them by typing a few words into the bar to get suggestions (if it were, I would not need to save questions in the first place).