No more voice oohs, choir aahs, synth voice, and other options for distinguishing different vocal parts?

I have a song sung by multiple characters, and I want each character to have a different synth voice sound in playback. In Musescore 3, I could open the mixer with F10 and change what a synth voice sounded like there. I had the option of oohs, aahs, choir, and literally anything else. If there were lots of characters, sometimes I would apply a different synth instrument to represent a 4th, 5th, or 6th character vocal line. Why can't I do this in Musescore 4? Or if I can, where has the feature been moved to?

I'll continue to use Musescore 3 on my old computer as long as I can, and only occasionally use Musescore 4 on my new computer for limited things.