I honestly doubt the image you’re showing is actually using a beam, BUT, if you do want to make a beam attach to a gui, I don’t think you can do it with screengui but you can do it with a billboard/surfacegui parented and adorned to a part
The technique the image is using MIGHT be what I said, but don’t quote me on that because there’s honestly no way for me to know since I’m not the developer of that game.