I’ve wanted to reduce the anti-aliasing ratio in my game, which is based on the C++ top-down template. The only setting I found was the In-Editor setting of MSAA which does not affect any separate game window.
have you checked under post process volume settings? There should be a box there that lets you set None, Temporal or FXAA. Where did you see the MSAA option?
I am not sure if there is a way to tweak the application of any of the AA solutions.