If I assign the Editor to Workspace 1 (STRG+1) and QuickReference to Workspace 2, I can switch to W2 without a problem and only get the QuickRef there.
But if I switch back to the Editor on W1, the QuickReference is pulled back over the Editor on W1. So I end up with both windows in one Workspace, instead of being able to quickly switch between Editor and QuickReference through circling Workspaces.