Sketch Tab

The Sketch Tab provides thumbnail previews of ten standard Sketch preset styles. Simply click on the appropriate thumbnail to select the desired preset, and then click the Render Now button to render your image using those preset values. Alternately, you can use the Sketch Preset pop-up menu to select from a list of standard presets and any custom presets you may have saved using the Sketch Designer.

To easily access the Sketch Designer for fine tuning your sketch settings or creating new presets, simply click on the Sketch Designer button. Please see The Sketch Designer more information about using the Sketch Designer render engine, 

The Sketch Tab.