9 Point Galvo Lense calibration in LB Ver. 1.07

When I try to use the 9 Point calibration with a new 300mm (F-420) lens the ’ Boundary frame’ extends beyond the 13" wide bed (300 mm is 11.81"). I’m unable to reduce the frame and output size no matter what dimension I enter into the ‘Output Box’ field. This feature worked well for setting up my 175mm lens but it doesn’t work with 300mm lens.