The Layout Order buttons are used to move objects within the FilmStrip.
Move Forwards
brings the object one step down the FilmStrip.
Shortcuts
FilmStrip:
Keys: Ctrl + [; Right-click FilmStrip, L, F
Move Backwards
brings the object one step up the FilmStrip.
Shortcuts
FilmStrip:
Keys: Ctrl + ]; Right-click FilmStrip, L, B
Move to Front
places the object at the bottom of the FilmStrip or Group.
Shortcuts
FilmStrip:
Keys: Ctrl + Shift + [; Right-click FilmStrip, L, N
Move to Back
places the object at the top of the FilmStrip or Group.
Shortcuts
FilmStrip:
Keys: Ctrl +Shift + ]; Right-click FilmStrip, L, C