Sony PCG-XG18 Primary User Manual page 31

The Jog Dial control window is in launcher mode until a software
application is launched or the Jog Dial control window becomes active.
When an arrow is displayed next to an item in the Jog Dial control
window, you can display a submenu of that item by selecting it and
pressing the Jog Dial control button.
The Jog Dial control window is in the guide mode when software is in use
and the software window is active. Depending on the software you are
using, you can select items from the displayed list using the Jog Dial
control. Some Sony software applications have two modes in List View,
Simple Menu and Full Menu. You can switch the mode by pressing the
shift key while turning the Jog Dial control.