Expand/Collapse for "Used Materials"

On some projects I have a lot of different materials. If nothing is selected, there is “Show more”/“Show less”, which is good. But if I now want to apply a new material for a selected surface through “Change Properties” I have to scroll down the long list of used materials first before I see the material library. Please add the little triangle also to the “Used Materials” section, like for the other Categories, see screenshots.

Material Library and “Used Material” if nothing is selected:

Used Materials if surface is selected:

Thanks and kind regards