I have sketchup pro 2022 for windows. I can’t change the lineweight in the tag screen. Does anybody know why? I have seen that it was possible ( How to Change Line Weights / Line Hierarchy in SketchUp and LayOut - YouTube)
You can’t change it in SketchUp.
Notice that the most part of the video you linked is about Layout…
In SketchUp you can change the Section Line Width by editing Style.