I just don't understand what you are trying to accomplish. Maybe its all just a misunderstanding due to using "adaptive" as an option. I'll try to explain:
ANC -> Active Noise Cancellation.
Transparency -> Use the mics to hear the outside sound through the headphones
Adaptive -> This will adjust the ANC-Transparency level depending on the outside sound.
First two options are manually adjustable with the bar. Full left, max noise cancellation, full right no cancellation at all and all the outside sound amplified and audible through the headphones. If you set the bar to the middle (see pic) you won't have either ANC or Transparency. No noise cancellation will be used (besides the passive of having the cans over your ears) and no noise from the outside will be feed through the cans. I never said setting the bar to the middle will give you full ANC, I said it will disable ANC.
Adaptive, toggled by a checkbox, will disable the ANC / Transparency bar (at least in the latest versions of the app, good, Sennheiser) as its intender to automatically adjust depending on the environment. If you are in a quiet place you won't have a lot of ANC as it wont be needed. If you are outside, you will most likely get full ANC as there will be a lot of noise.
PS I think the adjustable bar its pretty intuitive, specially with the pic with the noise level in the background. The Adaptive option is also intuitive given it has a description, "ANC automatically adapts to the environment".