Glad to hear the default Midnight theme is working for now!
If you go here:
https://communities.sas.com/t5/SASware-Ballot-Ideas/idb-p/sas_ideas/label-name/sas%20visual%20analytics
You can submit an "Idea". These posts are reviewed by the product management team, although obviously we can't promise we'll get to it right away.
This feature is a good suggestion -- it seems logical that you should be able to at least change the font color of the legend.
FYI, in many places in a report where you have text that is supplied by the user (object titles, page names, etc) you can double-click the text to edit its properties, including the font, font color, and font size. But generally this is not available for generated text such as legends.
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