Ok, thanks, so Standard maybe would be better named "Single Value" and Advanced is "Range".
I have setup as advanced to have a range slider, setting min field and max field both to same field price but... the filter does nothing (every record is shown, also where the price is outside the range) and infact in the frontend I get a "Uncaught Error: Syntax error, unrecognized expression: # price"
What is wrong?
Thanks