Could you explain what you mean? The app only allows assigning the whole app to a specific workspace. So you can't have one window of the same app in workspace A and another in workspace B. It's done this way because it's the most efficient way so far, but of course I understand that sometimes people may want to have multiple windows in different workspaces. I'm going to investigate a possibility to manage apps on a window-level basis. But macOS is the limitation here, if it's slow then my hands are tied.