Too dark background color in the Key-Editor

I am new here (crossgrade from Sonar) and I have a little problem with background color by selected notes:

Is this a bug? What should I set for this:

The custom color does not help!
I have Cubase 9.5.10 Pro / Windows 10

I suspect it’s a bug. I don’t get quite the same thing here, but I don’t seem to get a response from custom color either.

Seems similar to my posted issue.
In Pro 8.5 backgrounds were white by default.
A template workspace with default colorscheme 8.5 would be apreciated.
Grtzz Larenzo

It definitely looks like a bug.