How to sort Legend by y-axis within line chart?

Hi jaryszek 
Unfortunately, sorting Legends by Y-axis values is not supported on the default tooltips for the visuals.

You can create a custom tooltip and use it as sorted by y-axis values.

I created a Custom tooltip page with Date and Legend and values.

Sorted the table visual on custom tooltip by Sum of Cos in billing currency.

Added this custom tooltip as a tooltip on the line chart.

When you hove, you see legend values are in descending ouder of y-axis values.

Just adding a small video to showcase ow it will change with X-axis granularities but still maintain the legend sorting by values.

I am also attaching the PBIX file download link here.

https://we.tl/t-9rthucYZEf

Hope this solution helps.