The V-Groove Exterior Overcut controls where the Blade Retracts from the Matboard (not the Fallout) on the Exterior cuts of the Outside Cut of the Non-Oval V-Groove.
The Exterior Cut is where the Blade Plunges or Retracts from the Matboard (not the Fallout).
If the Exterior Overcut on the Outside Cut of the V-Groove is cut Too Long, Decrease the Exterior Overcut.
If the Exterior Overcut on the Outside Cut of the V-Groove is cut Too Short, Increase the Exterior Overcut.
The V-Groove Exterior Overcut field is marked with a Red Arrow on the Configuration screen and the Map illustration.
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See: V-Groove Exterior Overcut Configurations