By default, Don't Knock Twice’s frame rate cap is unlocked, so there is nothing you need to do to unlock it.
Texture Quality - Low/Medium/High
Shadow Quality - Off/Low/Medium/High/V.High
AF - Off/2x/4x/8x/16x
AA - Off/FXAA/TAA
Ambient Occlusion - Off/On
Keyboard/ Mouse Options
Gameplay Options -