Almost invisible, have to use my louppe glasses, even i have a 4k 43 inch large monitor, imagine 4k smaller, that are the most. I have software of many different kinds, and don't have this problem. not solved in 1.6, hope you solve this in next version. Anyway excellent work in upgraded latest version, with the new enhancements. Congrats. have used this slicer for many prints with Elegoo Mars, flawlessly. It's A great software, and sure i would buy it, if you launch a pay version. Thanks.