I don't think that there is any global way to change the default fonts used by IDL 8.6. According to "What's New in IDL 8.6 page": Graphics Font Improvements The graphics functions now use the DejaVuSans font by default. This produces better-looking text in plots and visualizations. If desired, you can use the FONT_NAME property to switch back to the default "Helvetica" font. See PLOT, TEXT, or any of the other graphics functions for details -David Harris GS
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