Changing scatter chart marker colors

Hi.

By default, the scatter chart markers are usually light blue, but when a data point is selected, either by clicking on its marker, or by using a slicer, the markers change color to dark blue.

I have been looking in the various formatting settings, and also in the 'themes' but I cannot find a way to change these default colors. Ideally, I'm happy with the light blue for unselected items, but I want selected ones to turn red.

I have used the method outlined at https://blog.enterprisedna.co/scatter-charts-in-power-bi-highlighting-key-points/ , which works fine, unless there are two overlapping markers, when the default colors reappear.

Surely there's a simple way of changing the default colors to light blue (unselected)/red(selected)?