How to use MuseSounds with Musescore 4.5 mixed percussion

Hello, I saw in the 4.5 release video that you can "work with a wide selection of percussion instruments on a single stave while enjoying the exceptional playback of MuseSounds". This is a feature I've wanted ever since MuseSounds was a thing, and I was really excited to do this, but I can't find a way to do this; the 'Mixed Percussion" instrument loads up with the default "MS Basic" soundfont and there is no option to switch it to using Muse Percussion.