Audio clips and background / selection shades

[LouHela]

My old eyes are having trouble viewing selected areas of audio clips. Here are 3 screenshots taken consecutively:

S1: In this screenshot nothing is selected.

 

S2: Here, the whole clip has been selected by clicking on it, and the lighter background is displayed. Nice and bright!

 

S3: However, here I have selected a region of the clip by click-dragging, and the light background disappears completely and the selected region has a BLACK background. I can barely see what I've selected.

 

Is there any way to make a selected region as light as in Screenshot 2? Or, indeed, change the whole backround color of a clip?

Changing the color of the waveform is not what I'm looking for.

Thanks and BR.