Matboard Float Layer: Properties Tab

A Float Layer is a designated bottom layer that contains No Openings which can be used to adhere three-dimensional objects. 

This layer will not cut unless Cut the Outside is selected.

Select the Add Float Layer to add a Float Layer.

The bottom layer is now set as a Float Layer without an opening. 

To remove the Float Layer, Unselect Add Float Layer.

The bottom Float Layer is removed.