Bar repeats color background

I have failed to change the blue background of bar repeats. I want black on a white background, and all I can get is black on a blue background.

These are the colours you can change in Dorico.
The background of bar repeats doesn’t seem to be one of them.

On my black and white printer, the blue background of bar repeats either shows up gray or solid black.

What happens if you deselect View > Highlight Bar Repeat Regions?

These shouldn’t be printing at all. Make sure that the View options checkbox in the Annotations section of the options panel on the right-hand side of Print mode is deselected.