Change direction if colors in PC GEQ 2D

I installed WLED on a ESP32S3 Matrix (with 8x8 WS2812-2020)
and got it working quite well. The colorspectrum i use is C9 2
But: instead of the spectrum showing the amplitude, it changes with the frequency.
So the low frequencies show a different color than the high frequencies, but the same color for every amplitude,
Normal is that the low amplitudes are red and high amplitudes are yellow, for all frequencies..
I can’t find how to change the direction of the spectrum….
Help?

Kees