Well now that we know it was the Post Processing, we can go into your Post Processing Volume and edit the exact feature or technique that is causing this issue. My first guess would be to change your AA settings within the Miscellaneous section of the Post Processing to FXAA.
To answer your question, the console command I gave you does completely disable the post processing in your project, but you can use a Post Processing Volume and edit the particular values within to get the desired look and feel you would like, instead of just disabling it altogether.
Cheers,