If you prefer menus, it's Menu -> Format -> WCS -> Display WCS. If you prefer icons, you can turn the icon off or on using the Customize command, then Commands tab, under the Category named All Border Bars/QAT -> Top Border Bar -> Utilities -> WCS Dropdown.
As usual, typically more than one way to skin a cat using NX.
Tim Flater
NX Designer
NX 11.0.1.11 MP8
GM GPDL 11-A.3.3
Win7 Enterprise x64 SP1
Intel Core i7 2.5GHz 16GB RAM
4GB NVIDIA Quadro K3100M