About your Offset Helper lines you have better time to Make Offset of existing Curves (or anythingelse) with a special color!

Like this you can enable disable their visibility Styles from the Browser Panel! ;)
It's simulate a "Layer" system! ;)

And if you want really a special design of your Lines : PatternSelection by Max Smirnov

https://moi3d.com/forum/index.php?webtag=MOI&msg=6518.11