How to change sound in different channels (arco, pizz., trem., etc.)?

I just switched from Musescore 2.0 (finally) and am loving the new stuff in Musescore 3.0 except for the channels. Currently, I am trying to use a soundfont for a cello pizzicato sound, but I can't change the sound in the pizzicato channel; the Mixer only allows me to edit the sound that the arco channel makes. Does anyone have a solution for this? It used to be really easy to change the sounds in all of the channels in Musescore 2.0, so I think there's probably still a way in 3.0, right? Thanks!