At the moment, selecting game materials is a bit tedious, as it forces you to scroll through the entire list and the scrolling behaviour is a bit odd (it’s as if it combines the mouse position with how far you scroll). In the past, if I’m not mistaken, it was very similar to the Layer Presets and you could select the material by seeing them all at a glance, it would be a good idea, although a complex one given the higher number of materials available now. Another option could be a search function.