We really struggle with the color editor. There are SO many colors in there that are super-close together that it is very hard to find the one that is actually used in the image in a certain place. What we do now, is download the SVG, then edit the colors in another editor. Pretty cumbersome.
Proposed solution
If you could select a (sub)object in the preview, and it would allow you to set the fill color, stroke color, etc, that would be much handier.
Alternative solution
It used to be handier, with only the colors that were used in the image being shown. Now it shows all colors in the entire palette. Perhaps it's easier to only list the colors that are used in the image, so as to make changing them easier again.
This has really been a regression for us.