Use the Hide/Unhide function to hide (or unhide) a part reference that you select. When a part reference is hidden, its visual representation is replaced with a bounding cuboid that retains the color attribute of the hidden part reference. If the part reference had not been assigned a color attribute, it will take on the color set for Hidden Part Ref Box under File>Properties>Settings. The cuboid is aligned with the world axes of the referenced part. Hiding is primarily useful to reduce confusion when complex geometry is visible in the viewport. The reference currently highlighted will be hidden when the function is first selected, and a checkbox will appear beside the Hide function in the right click menu. To un-hide the reference, simply select the Hide/Unhide function a second time. When using the function from the Menu, you must select the reference.