Auxiliary Geometry Not Visible

Problem

The model contains guide curves and auxiliary planes, but they are not visible in the model.

Solution

In G4, there is a toggle that controls the visibility of auxiliary geometry.
The quickest way to enable or disable it is to press the "G" key, which switches auxiliary geometry on and off in turn.
This function can also be found in:
File → User Settings → Drawings and Models → "Show auxiliary geometry".