See Borders and Dynamic Outsides Toggle below for information on setting the Borders to the Top or Bottom layer of the openings.
Default Settings:
See Admin > Editor for the default settings for the default layer to apply the Borders.
See Admin > Defaults for the default settings for the Layer Direction.
Border Definition
The Border is the area of precisely definable width between the outside edge of a Mat and the edge of the Opening(s) in the Design Editor, Nesting, and Visualization.