Some properties, such as Volume, use vertical sliders or faders instead of horizontal sliders to change their values. The controls for Volume use vertical sliders to better simulate faders that are found on both hardware and software mixers. You can drag the fader up or down to increase or decrease these property values. If you need to define the value more precisely, you can Shift+click above or below the fader to increase or decrease the value in smaller increments.
You can Ctrl+click anywhere on the slider or within a text box to return a property to its default value.