The conceptual framework of the preset lists is from an alien planet.
The SHORT answer?
You cannot delete presets..once there is something there.. you can’t get tha ‘Insert Preset Here” slot again.
Easy workaround? Make an empty preset- like a reverb with everything set to Zero. Lable it “BLANK”. And copy that into every slot you want to be ’empty’.
Then.. set your range to only include whatever 68 or how many presets you want.
