It's off by default, but you can select 'On' to get the normal version, or 'Ultra' to get an even better effect. Today, there's really only three settings you should consider changing: However, most of these settings are also vestiges of a time when driver settings mattered much more for gaming.
Easily the most important submenu of all these three is Manage 3D Settings, which is full of graphics options you can change.
