You cannot see the entire honeycomb tray - you can see the usable area. Look at the printhead in the home position. It cannot move any farther to the left or any farther back. It cannot print behind the home position, and it cannot print to the left of the home position. The usable area of the Glowforge bed is approximately 10.9" x 19.5"
Here is a link to a file that can be very useful as a bounding box. GF Bed Bounding Box