You've always been able to (and should be able to) drag a window under the Unity7 panel. And you can drag it back out again, just using Alt+drag. So all that's missing in Unity8 really is Alt+drag and also correct placement so as to avoid accidental placement under the panel.
You've always been able to (and should be able to) drag a window under the Unity7 panel. And you can drag it back out again, just using Alt+drag. So all that's missing in Unity8 really is Alt+drag and also correct placement so as to avoid accidental placement under the panel.