With the addition of "UI Scale" to the accessibility settings, content from the client can be made smaller.
One thing that has really bothered me since the Friends & Chat migration to CEF is that the minimum size for both windows had increased, it has particularly bothered me with the chat windows, which have about 50% taller minimum size compared to the pre-CEF native interface, it would be nice if lowering UI scale would also allow the window to be resized to a smaller size, as that is currently not the case.