Go to EazyDraw Preferences. Click top left preference icon (User Interface ...) Use the new (new for EazyDraw 10), Icons button, bottom center of the panel. There are 3 choices, you want "Color" . I like Highlight because it keys off my system preference setting for Accent Color. It is easy to change.
All three settings work well with light and dark mode.
Make sure you have a recent version of EazyDraw 10 (10.5. or newer) as this new feature was recently improved.