Customizing Colors in Imported Themes for Visualizations

is there a way to customize color for themed visualizations that don't appear to be set anywhere? I just imported a ppt slide deck with zero brown, but somehow the imported theme in gamma has a ton of brown for things like smart layouts, timelines, and pyramids. it's an ugly color IMO that doesn't appear at all anywhere in the original... but I haven't found a way to change it I've turned off the accessibility option and triple checked every page that there's no brown color theming set in any of the pages, so now I'm at a loss of how to fix this imported theme thanks in advance! e\ I found the solution - under design, blocks & content, I'm able to change the "Block fill colors" from "Primary accent color" (which was brown somehow) to "Custom" - that actually has the accent color. not sure if this is intended or a bug, but the primary accent color it chose by default seems completely hallucinated