Sorry to say, but that is a shame. For a browser that prides itself on being customizable, it doesn't offer a simple feature that most of its competitors offer, and have done so for years now. I'm not trying to be passive-aggressive here, but at the same time, it's like, "come on." I hope the developers see this post, and reconsider tweaking the "dark" and "light" modes so to include a "custom" mode or something like that. Thanks.
Wanted to come back here and say that if Opera prides itself on offering options and customization to its users, it really should follow up on this suggestion, and get rid of the outline of the sidebar when it is disabled. I don't know what sgunhouse meant when he (or she?) said it "isn't disabled." What I would like to see is a totally clean interface when I am on a blank tab or a tab with just the speed dials (with or without wallpapers) that does not show anything that reminds users of how the sidebar is (or could be) there. Great browser otherwise. Thanks, and I hope the developers will follow up.
There is no in-built option in opera to export bookmarks. But that was for older versions. From opera version 47, we have an option to export bookmarks directly.
No Need to install any extensions / add-ons or third party apps.
Just update your browser to the latest version and from the "SHOW ALL BOOKMARKS" page, you can export the bookmarks to .html file.
However if you want to stick with the older version and want to export the bookmarks, I suggest you to check out this article to Export opera bookmarks to chrome, Firefox or any other browser.
Also check the video : Export opera bookmarks in versions 40+