image.jpeg > @mib2berlin said:
You wrote: "moving the tabs of a workspace to the main window work". I don't even know what you mean. What is "the main window"? I lose all tabs (253) in the All workspace if I disable workspaces, even after: "Select all tabs with Shift+Click on the first then on the last tab and choose Move > To this Window."
image.jpeg

I don't doubt that my install of Vivaldi is what it should be. The problem is that Vivaldi appears broken from a usability standpoint. Its documentation does not match how the program operates. What you have described does not work.

Thanks for the help.