As you can see, it has 4 operation modes and this is the result
The four operation modes are in the last line, the one with the yellom button. On the right there are the other 3 buttons that are almost invisible.
Passing with the mouse on each button, it will appear a small popup with the mode name
Is it possible to
have the mode name inside the button
have the button color chosen in the editor
have the other buttons more visible (I tried also other themes)
Good job finally convincing the forum to let you post this
The features page lists a number of “available” operation modes under the water heater operation modes section, I suspect that if you choose anything outside of this acceptable list, it won’t have an icon to go with it: Features for dashboard cards - Home Assistant (home-assistant.io)
I’ve not used this feature before, but is there some way you can map the HA mode (which has a suitable icon) to a device mode? There doesn’t seem to be anything in the documentation about an icon setting. Might be worth a shot and see if you can force it though?