More Library Manager weirdness here, not nearly as weird as last time around though. When I click on the inequality sign over on the left that applies to a Collection, it only “sticks” if I select that Collection first. Likewise the reverse: if I want to click the leftward-facing-arrow-that-becomes-an-X, I have to select the Collection first in order for the options to propagate.
Yes, I’m afraid this is a bug. We think we know what the problem is here so hopefully this should be OK in a forthcoming release.