You can set the order of the apps displayed in the QSlide bar, as well as which apps are displayed.
Open the Notifications panel, then tap the QSlide icon to display the icon bar (if necessary).
Tap the Edit icon on the far right of the QSlide apps bar.
Drag one of the icon handles at the right side of the screen to move its icon to another position in the QSlide apps bar.
Checkmark the QSlide apps you want to display and remove the checkmark for the ones you want to remove.
Tap the Back Key (in the Touch Keys bar) to return to the Notifications panel.