The quick setting panel lets you select the manual controls for the camera to quickly adjust all those settings that are required for the scene you are working with in one quick place.
The AE button will toggle the options for controlling ISO, and exposure values. The AWB button will let you toggle the options for controlling tint and white balance values. The focus button will let you control the camera focus values. The zoom button will let you control camera zoom values.
When selecting on of these options the button will a dark grey selection background.
When unselected the sliders will show a hollow disable track button, when in shown in full the track button will let you use the slider to adjust the needed value.