Use the Cut the Outside checkbox to select whether or not to Cut the Outside of the mat.
This can also be changed on the Cut Preview.
When Cut the Outside is selected, the matboard displays as a Solid Color.
Unselect the Cut the Outside to not cut the outside of the mat.
Info
Unchecking Cut the Outside displays the 1.5 inch (3.8cm) Uncuttable Region in a checkerboard pattern. The uncuttable region is the portion of the matboard that is placed into the CMC rails when cutting.
The Z1 and Z(9000z) will not display an uncuttable region because of the Zero Waste clamping system, unless the matboard dimensions entered are larger than the machine can physically cut (see Uncuttable Region).
Do not place objects into the uncuttable region unless you select Cut the Outside or use the Auto Offset.