Hi Steve,
The dLive has a dedicated “DCA mute” LED under the mute button that illuminates when that the channel is DCA muted. This is separate from the mute button on the channel strip, but located just below it.
So it’s always clear why/how a channel is muted, but I haven’t found a way to achieve the functionality you’re looking for, of unmuting a channel that is DCA muted. A&H confirmed that here: https://community.allen-heath.com/forums/topic/mute-groups-on-dlive/#post-48704
There has since been a firmware update that lets you use DCAs as mute groups, but my understanding is that they’re just DCAs without the level control.