In short
Screenshot or save the on-page graph — bitmap mode is gone.
Graphs are drawn in the browser (not a separate “bitmap mode” download).
To keep an image:
- Screenshot the graph area (OS screenshot tools, or your browser’s capture).
- Or use your browser’s context menu on the graph canvas / image if it offers “Save image” / “Copy image”.
There is no supported /weather/settings/bitmap toggle anymore (that link only sent people to location search).