NOTE: Make sure the firmware version of your D1 or D1 Pro is the latest, which is V40.30.006.01B5 for D1 and V40.31.002.01B5 for D1 Pro.
1. Click on Device Settings on the Main Toolbar in LightBurn and find the Working Size option under Basic Settings.
2. Set Width to 430mm and Height to 930mm.