Hearing only one instrument in "parts" with Musescore 3

In Musescore 2, I was simply able to go to the parts section of the instrument to hear it solo, then I could switch back to the main score to hear all of the instruments. With Musescore 3, this feature seems to have been removed as I am unable to listen to a single instrument without clicking the mute button on the mixer or deleting every other instrument then undoing it. Can anyone help? Thanks!