how do i removed orphan linked material I have two materials that I linked from another file  and I can't figure out how to delete them. As you can see, both HairMix and VariableMaterial show LF in the search box. They do not go away when I close and reopen, because of the F state. How do I remove them?  [edited in response to a comment pointing out that the original question was invalid because I had misunderstood L to mean locked, rather than linked.]
You can delete the material by right-clicking on it and selecting delete from the pop-up menu. This won't affect them in the other file, it just removes them from the one you are working on.