In the image below, you can see there is an "include" check box in the rear fender section of the Fender dialog box. If the include check box is unchecked you simply won't see fenders anywhere. If you check the box to include fenders, you then have two display icons for controlling the display of that fender. The eyeball icon in the Fender dialog box controls the display of the fender in the main view. The Fender display icon in the Stays (Auxiliary view) dialog box controls the display of the fender in the auxiliary view.