To preview changes you make to 3D settings
From the NVIDIA Control Panel navigation tree pane, under 3D Settings, select Adjust image settings with preview to open the associated page.
The options on the page enable you to change the image and rendering settings of your 3D applications that utilise Direct3D and OpenGL technology.
Any time you use any of the options and settings on this page, the image rendering is shown in the big Preview window. You can also view the Performance and Quality components of the rendering in the smaller Performance and Quality preview windows that appear on the left side of the page.
You can click the Pause button to pause the animation in the Preview window. The button changes to Play, which you can click any time to resume playing the animation.