Altium Designer (AD13) method of hiding copper deposition __PCB

Copper-coated, is the PCB on the space as the base surface, and then filled with solid copper, these copper zone is also known as copper filling. The significance of copper deposition is to reduce ground impedance, improve anti-interference ability, reduce pressure drop, improve power efficiency, and connect with ground, reduce loop area.
If you get someone else's PCB, there may be large tracts of copper deposited, affecting the wiring of the observation. If the removal of copper, but also afraid of unexpected trouble, then can be hidden deposited copper.
Method: Shortcut Key Ctrl + D, select Hide in the polygon.