You can use an undocumented setting in ui-prefs.conf: [default]
display.visualizations.charting.seriesColors = [0xea1b0a,0x1ea2b1,0xb00402,<ADD YOUR COLORS>] It just didn't work as embedded report. Everywhere else - it looks fine. If you need to set the seriesColors for a specific embedded report - you can add the property in the stanza of the report in the savedsearches.conf: [myreport]
display.visualizations.charting.seriesColors = [0xea1b0a,0x1ea2b1,0xb00402,<ADD YOUR COLORS>]
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