Set the Tiling defaults for cutting the same design across the matboard from the Setup Tab on the Cut Preview.
Set the default Spacing between designs when Tiling.
Example: Enter 0 inches when cutting with a Shared Edge.
Tiling the Design: Setup Tab
Tiling: Number of Mats: Setup Tab
Tiling: Sheet Size: Setup Tab
Tiling: Spacing: Setup Tab
Tiling: Total Sheets: Setup Tab
Sheet Size: Cutting Default Setting