How to re-dock window in material editor?

I undocked the graph following the tutorial, but I cant seem to find how to dock it again…

Yeah, I had to figure this out a little while back. You grab it by the tab portion and bring it back to where it was and the transparent guide appears and you can drop it in one of the slots. Key is, left mouse grab on the tab, doesn’t work if outside of tab. Good Luck.

thank you it worked. I feel so stupid now