Is there a way to change the colors of the interface (other than dark theme)

My eyes sometimes have a hard time distinguishing between the blue (undefined) and black (defined) parts of a sketch. One of my sketches has a message "[Sketch] is not fully defined." It's a relatively simple sketch and I cannot find any line, dot, circle, arc, that has a color of blue. I think it would like to change the Overdefined color from red to hot pink and Undefined color from blue to red. For me Overdefined is rare, and everything turns that color. There's not that much contrast between the blue and black, so my eye doesn't easily find the issue. Knowing how there are American lawyers that love ADA class-action law$uits (free money), I have to believe that the product is ADA compliant.

Another solution to my issue would be a button (or other interface) where I can click and the product highlights the undefined items.