Climate action incentive

I am trying to deselect the alberta climate action incentive for my father (claiming through my mother).

Our tax returns are such that I need to file their returns seperately because of the caregiver and disability credits that they have transfered to me. No other way around the system always using it for each other needed or not. It used to have a check box to deselect this if someone else was claiming it but now it is gone. Not sure how to not have the alberta climate incentive go through on my fathers return.