History Graph Card unselect all but one parameter to show

I have several temperatures in one graph.
At time it would be nice to press (for example ctrl) and click on the one and only graph that I would like to see.
Now I have to click on all but the one I want to see.
What I am suggesting to implement feature that would allow to ctrl click on the one to be left and all others should be hidden.
Thanks,
Carlo.