The Reverse Bevel - Front of Mat is when the Angle of the blade cuts the Matboard surface so it Slants Under the surface of the Matboard, and the Matboard Core is Not Seen from the front.
Cutting From the Front will cut with the face of the mat toward the operator, and can be selected on the Cutting Preview or by cutting a Cut-From-Front element such as a Deboss or V-Groove.
The Bevel Type is the Angle that the blade cuts on the Matboard/Fallout surface when it is not cut at a 90° Right Angle.
Select Reverse Bevel - Front of Mat from the Current Bevel Type dropdown control to edit this configuration.