If I double click the LightBurn icon the software opens in nonfull screen. I need to click the full screen box two more times to have it open full screen . Is this a windows setting or a setting in LightBurn?
Right Click on your LightBurn icon and select Properties. In this screen, change the Run: section to Maximized. This will force LightBurn to open up maximized full screen each time. It’s likely set to Normal Window now.