: Use Add > Line and set the class/subclass to Board Geometry / Design_Outline to define the physical boundaries.
Eventually, the 16.3 platform was superseded by and later the modern OrCAD X platform. While 16.3.33 served its time as a stable, industrial workhorse, newer versions introduced AI-powered placement, cloud-connected workspaces, and drastically reduced learning curves.
: Go to Export > Gerber . Define the layers (Top, Bottom, Silk, Mask) you wish to include.