I had the same problem, I didn't uninstall or delete anything. Just downloaded the opera setup from the official website and installed like nothing happened. It worked, even I had my open tabs! 58e4635d-d9d7-445c-8178-29efc105521a-image.png

@henryzx900 By miniscreen you mean the task-based preview? The window is outside your screen, while Opera has focus press Win-D until it appears on-screen.

@trumpman (my previous reply was clipped off and no option to delete; here is the complete reply)

@violetphoenix - Actually, that is not totally correct. When you use Ctrl + Shift + B (or from the main menu), a pseudo-sidebar is opened on the left. You still have to click on the "Open full Bookmarks view" link at the bottom to get the former complete bookmarks edit page. This is per version 71.0.3770.284