Topic on Talk:Mass Effect Legendary Edition
There's nothing to fix. Since there are no working compatibility flags for AA in DX11 it's impossible to enforce any kind of proper AA via the drivers. SGSSAA included. Now if the games had native MSAA support it'd be possible to enhance it to SGSSAA via the drivers, but that's not the case here. You'll have to use DSR. (set the resolution you want in the config files; they can be found in Mass Effect Legendary Edition\Game\ME#\BioGame\Config (replace # with 1, 2, and/or 3 as needed) under the file GamerSettings.ini)