So, I would suggest adding an option to a group definition (or a way to customize a group) to hide the master switch of the group card. Something like: master_switch: no
Maybe this is a tangent to the request, but it might also be useful to instead of hiding the switch, configure the switch to turn off a specific entity.
For example, I use harmony-api to create some mqtt switches, and then I have a group of with my activities. I have one switch that’s called like “TV” that turns on the my default activity. By having the master switch, turning it on or off would turn all the groups on, including the ‘default’ thing. Ideally, I’d just like the master switch to toggle the configured TV switch.
Using some magic smoke (I asume) the group.all_automations does not have a group switch. My group ‘Voorkeuren’, which contains Input Boolean’s, does (and I would like to disable it).