I recommend that on the next firmware they add a press-and-hold for one of the buttons on the device itself to change modes, and a voice prompt should say which mode it has changed to so that it is clear what mode we are in without having to go to an app.
The beauty of a Jabra device is YOU DON’T EVER FIDDLE WITH ANYTHING, you plug it in or pair to it, and it just works. Period. No settings to worry about. No Setup time. You turn it on, you use it right now. That is the standard your speaker and others are held against.
A single or multi-person mode is a good idea but it CANNOT be buried in a special app that you have to root around in to get to the setting and change it. People will accidentally have the device in single-person mode for a group and they will have a bad experience with your device as a result, and I am a developer myself so nobody knows better than I that “The user is never to blame, you simply didn’t make it easy/clear enough”.
The app should be there for firmware updates, user manual, troubleshooting, maybe some detailed info, but any significant setting needs an option to change on the device itself.
How would people like it if the only way to change the volume on the device was via the app?