Linux has its own notion of workspace. When running an application, including Chrome, Firefox, etc., I can decide I want its window (and its running instance) to live in a different workspace by right-clicking on the window title bar and choosing to move it to one of the workspaces I have configured.
Opera appears not to offer this capability.
Because Opera has its own notion of "workspace." This makes it exceedingly difficult or impossible to search for discussions of this topic in which I'm asking how to move an Opera window from one Linux workspace to another.
If anyone else has worked around this, please advise me.