Hovering over the Events Colors box and using a mousewheel has no effect on any of the color settings. This was an issue in 9.5.10 and was fixed in a later update, but now it’s back in Cubase 10. Very disappointing considering that it was already fixed.
This demonstration was taken from a CB 9.5(JohnFromEngland) thread here:
Steinberg! Please fix this once again.