One could just open the Bookmarks page/tab again by pressing Ctrl-Shift-B and then pin that tab. That way, bookmarks are easily accessible; in fact, pressing Ctrl-Shift-B again will take you right back to that pinned bookmark page/tab.
@robdaddy As anyone can clearly see, this topic is for requesting a feature to keep Opera always on top and no problems are being reported or discussed here.
So create a new topic in the proper forum to discuss your issue. Don't forget to read the rules before do it.