Mirror features?

I am new to SolidWorks, and I am doing the tutorial exercises. I have problem when trying to mirror the holes on the face.The mirrored holes don't show on the other half of the face, but it is in the FeatureManager design tree.

Thanks in advance.

Adding the Screw Holes (continued)

Now mirror the holes to quickly copy the existing hole features across the Front plane.

  1. Click Mirror on the Features toolbar.

  2. In the PropertyManager:

  • Under Mirror Face/Plane , select the Front plane in the FeatureManager design tree.

  • Under Features to Mirror , select the hole feature in the FeatureManager design tree or in the graphics area.

  1. Click OK .

The holes are mirrored across the large face of the hinge.

  1. Save the part.

SolidworksParts And Features