There is a tab control at the bottom of the main tab control. It contain help texts and two options for changing the UI look and slider behavior.
When you move your mouse over a control the Help tab sheet display some explanations and hints about the control. If you deactivate the check box in the bottom right corner, the help text does not update.
The Skin combo box lets choose between 15 skin types. The None option shows the normal look of the operating system. The other skin options imitate the look of the user interface of various applications, e.g. Lightroom, Photoshop, Photoshop Elements, Paint Shop Pro.
Normally the preview is only updated when you release the mouse button after dragging the slider knob. With the Instant Slider check box you can make all slider instantly update the preview, which means that you will see an effect in the preview while dragging the slider knob.