You actually can if you watch the tc furlong deep dive session on Avantis they figure our how. It’s available on YouTube
In your Avantis put the geq on faders then press and hold down the reset button next to the screen then tap the fader of the frequency down and it will move it to zero for individual frequencies
Or old down the reset button and press on the orange highlighted geq on screen and that will flatten the whole thing
Hope that helps