Printer bed too small Firmware Marlin 1.0.0

Hi Guy’s I am fairly new to 3D printing but have just got involved in printing Covig head bands for use in the NHS, but although my bed has a working area of 200mm sq, my printhead travel is limited to about 190mm which is just a bit too small to print the headband.

I connected to the Arduino with PUTTY hoping to see a configuration list like I get on my CNC system so that maybe I could change something to increase the width but I just get an echo of some of the entries in the control panel, nothing I can relate to print width.

Can anyone help??

regards John