Hi there!
Ive been looking all over the place for a way to actually disable anti aliasing. Im using Affinity Photo and it is a huge pain in the back. I cant't do anything with 2D objects which was my point of doing it as it softens the edges making them turn black when i export then import into the program requiring it. I found https://affinity.help/designer/en-US.lproj/index.html?page=pages/Layers/layerBlendRanges.html?title=Layer%20blend%20ranges for designer but cant find anything in photo. I've been trying to find something or a work around but at all points its really just find a better program that wont waste your time. If theirs a solution ive been very happy with affinity style layers but this anti alias and blending garbage is just wasting time and computer space.