The current version is what - 22?
Being able to sort & organize bookmarks should be an integral part of the browser. One shouldn't have to install an extension to be able to organize & sort bookmarks.
I read, I think on this forum, that someone used the sort capability in Finder to organize the bookmarks. That shouldn't be necessary.
I tried Opera a while back & when I realized that it isn't possible to organize & sort bookmarks, I uninstalled it. It was on & off my Mac in minutes. Likewise, this time. I installed it & then a few minutes later I uninstalled it.
Get with the program, Opera!