I don't know if this has been listed/suggested as yet. When one brings up the library list in L4M it always comes up in the same rather small window, I always end up having to make it bigger to see more of the books list. This is particularly the case if one has a larger screen — as many people do nowadays.
It shouldn't be too difficult to register the last library window dimensions and use that when opening the library window each time. Small thing but will be helpful for users.