Select the Reverse Bevel checkbox to make the selected layer a Reverse Bevel.
Select the RB button to make all of the layersReverse Bevel.
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Reverse Bevel Definition
The Reverse Bevel Opening is created by cutting into the matboard surface with the blade angled at 45°/52°, thereby slanting the bevel under the matboard surface. The matboard core is not visible from the front.
The Bevel Type refers to the angle at which the blade cuts the surface of the matboard when it deviates from the 90° right angle cut.
Select Reverse Bevel or Reverse Bevel-Front of Mat from the Current Bevel Type dropdown control to edit this configuration.