To create a Virtual Calibration Board you need to go into the Object Tree.
With a click on the (+) you can create a new Calibration Screen.
Choose as paddern “Charuco Board”
Open the container “Charuco”
This settings needs to be defined and needs to be the same like the real calibration board.
After a click on “Resize Board” the Calibration Screen will be display correctly and apply the correct size automaticly.