Would it be possible to eliminate the white part of the spectrum?

[xugmu]

Hello, the program is the best sdr bandwidth analyzer right now but I think it could be improved graphically, just removing the white part and leaving only the orange part would be almost like a "real" analyzer.

It would also be good for me to know how to modify the program. My knowledge of programming is limited, but I could try it if I knew how it was created.

Best Regards