Improve the Isolines accessibility

[idefix37]

Would it be possible to include the Isolines in the quick menu?
This would be very useful because it is really painful to open More layers each time we want to select one of these Isolines. In addition I am quite sure that many users ignore this feature that is so hidden.
Here is how we can imagine it:

This improvement should be applied to both the website and the phone app.

[A Former User]

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