I tried to drag a terminal screen from one workspace to another, and it didn't work.
From the keyboard you can use
Ctrl+Shift+Alt+Right/Left/Down/Up depending on which direction you want to move it to. To do it graphically select the workspace switcher in the Launcher (or press
Super+s) and drag it from workspace to workspace while in that view. Hit return when you're finished to return to the normal view.