I found I needed to select the site grouping before being able to change the filtering, which makes sense. Some interesting insights already, especially when one selects >8 stalls at a site.
Yes, I will try to see if I can have it remember your preferences for that filtering (no promises though) as I suspect it will be fairly common for people to only want to see high power charging stations for example.
And my dumb question for the morning. What does the range slider do?
The better question is what should it do, as I was just noticing this morning the functionality is not quite 100% there.
Basically the range slider adjusts the diameter of the range circles if you have them turned on:
(I adjusted these down to 25 miles so it would be more obvious).
The part that doesn't work is that the pop-up window has a "circle on" link that should turn on the circle for an individual station, which these days (with very long range vehicles and a reasonably dense network), and with the variation in the types of stations on this site, seems like the only useful point of the range circles. So right now you can only turn them all on or off, not individually.
In the early days of the Supercharger network, I suspect having all the circles on made more sense as it helped highlight holes in the network, but we are kind of getting past the point where there are any true holes.
Now the questions you DIDN'T ask are why can you not turn off the Range Adjuster and what does "Rendering Options" do? For the former, I don't know...I'll have to look into that. And as for the latter, I don't really know either. If I look at the current supercharge.info site, those two menu options are now "Range Circle Options" and "Rendering Options". Range Circle Options brings up some styling options for the range circles, and Rendering Options toggles the range slider as well as the new pin and clustering options they just added.