The Compella bed is intended operate at either 40” or 50” width — not at widths between. When adjusting it, you'll hear a repetitive triple-beep and see an amber-colored indicator (located next to the control) flash until the bed reaches either its fully expanded or its fully retracted position. To adjust the bed width, press and hold the Width Expand or Width Retract control until you hear a single beep, which confirms the bed has reached the desired width. A continuous green light indicates the bed is either fully expanded or fully retracted.