Use Cut Layers Stacked toggle to cut and assemble the mats while they are still in the machine.
Stacked mats can only be cut from the Back, so it cannot include any cut-from-front elements, such as V-Grooves.
The Cut Preview will display Stacked if the Cut Layers Stacked feature is being used.
Toggle the Cut Layers Stacked Off to turn off this feature and the Cut Preview will no longer cut as nor display Stacked.
Click Options > Stacked Mats on the Cut Preview to cut and assemble the design while in the machine.
See the Cut Layers Stacked button on the Cut Preview.