Yeah I need to fix this. It just isn’t saving the preference, though I don’t know why it shouldn’t. To be honest I only own a single Sonos device, so I just never tested that.
By the way, when it is fixed you’ll notice that all of those dropdown are the same. If you select a speaker in one, then it’s changed in all of them. But only for that app. So if you make a batch action (the + Add Action button) then you can command different speakers.