Reversed Slope Palm Lift
Removable palm lift for a more natural wrist position.
Detachable Palm Rest
Work in the position that's most comfortable for you with detachable palm rest and adjustable keyboard legs.
The above is quoted from the items description, so yes it does come off, in fact it looks as if two parts come off - the palm lift and the palm rest! Usually just plastic clips, just needs a bit of care, as well as a bit of pressure. Though my own is different.