Soundfonts in MS 3.6

Hello all,

I've been using various Soundfonts on a bunch of my compositions to get a more realistic sound than the standard MIDI. Prior to the update to Musescore 3.6, I used to be able to change the sounds of instruments in the mixer tab, but the option has disappeared ever since I updated. As of current, I get absolutely no sound from any new compositions started, even when I reset everything to default.

Am I missing something?