Opening a second project view tab.

I’m trying to drag a script into a prefab. The problem is, I need to do it with hundreds of prefabs, so there’s lots of slow dragging. Is there any way I can do this in one click? Or can I at least open a second project tab so I don’t need to scroll back and forth?

You probably want to write an Editor script. However, to answer this question, there is a drop-down menu at the upper-right of every panel. Click it, add what you want, close the tabs you don’t want, if necessary.