Hi. My materials drop-down menu is populated with ghost lists like ‘Caches’ and other folder names I have on my computer. The ‘Remove’ feature doesn’t eliminate the lists permanently.
There was a long discussion about this recently. It might not have been in the forum, but the outcome was that the Materials folder path had been changed to something else. I think in your case it’s set to /Library.
Go into Preferences, Files, and look at Materials. Click on the pencil icon, and in the file dialog that appear type Command-Shift-G. Paste in this text: