Different line thickness in SketchUp

[Cotty]

There are a lot of topics about this already, e.g.

Thickening Lines in Sketchup

Good day everyone! I am here with another newbie question. I created a sort of complex design using a system of lines, is there any way I can thicken the lines? Or do I have to recreate the design with a system of squares? It would be weird if you couldn’t just thicken lines… Thank you for your guidance