The beta is at version 57-something, yet no such feature is in sight.
I think this is slated to be once again a most-requested feature that will be perennially ignored and held in contempt by Opera Software, just like form autocompletion was in Presto-based Opera.
@sgunhouse I tried the prototype bookmark manager just now, and found a couple more issues with it:
Doesn't seem to have a list view (only thumbnail view)
Trash folder takes a few clicks to render and there's no option to empty it
the Search doesn't work but you guys probably already know that one
The dark theme looks awesome though, really looking forward to just that haha