LinesMesh is too thin and fine by default. It’s possible to make it look like stronger?
For a 2D line see Draw a Line With a Set Width | Babylon.js Documentation. In 3D you can use a tube with a smallish radius to represent a line.
It seems different with LinesMesh. LinesMesh will not change size when camera use “zoom”, and the method “2D Line” will be changed in screen
The simple answer is unfortunately no.