I’m running Ubuntu Studio 20.04 with Pulseaudio and my output device is Simultaneous with 4 different cards so my PA Volulume Control takes up the width of one monitor. Each open app volume now has this long Simultaneous Output device name without anyway of shortening.
The xfce4-pulseaudio-plugin can’t view playback volumes.
XFCE Mixer isn’t supported anymore.
I could go the Non-mixer route again but I don’t remember if it handles application volume.