Display the location of zones with a toggle

[PatrikLundell]

Is your feature request related to a problem? Please describe.

Managing zones is a hassle because you can't see where other zones are (unless you cycle through them in the list of zones already defined and manage to memorize the exact boundaries of them).

Similarly, it can be handy to be able to see where your zones are so you know where to look for things.

Solution you would like.

Some kind of transparent overlay that shows where zones are, preferably with different hues for different kinds of zones. This ought to be possible to toggle on/off so people can set them to whatever they prefer (such as e.g. turning them on temporarily and then turn them off again, or leaving them on/off permanently).

Edit: It would be useful to be able to toggle zones individually, as I don't think many people would want Storage zones to be shown permanently.

Describe alternatives you have considered.

Another alternative would be to indicate zones with boundary markers, similar to how zones are displayed in when selected in the zone list. Again, it would be preferred of different zone types had different colors/hues, and that it would be possible to toggle them on/off.

Additional context

It might be possible to implement the functionality using fields.