Remove Scatter plot point black circle

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Hello all,

Sorry this is a XPOST from "Data Mining", I didn't notice this Support board.

I haven't found a way to remove the black circle of the points in a scatter chart. Is there any way to remove them ?
I use the "advanced chart" feature to build a colored scatter plot chart, but as I have a lot of points, the black circles make my chart unreadable

thanks for any help !