Why do I offset the line in two directions, one toward the inside and the other toward the outside?

I would like to ask a question, why do I offset the line in two directions, one toward the inside and the other toward the outside?
How to solve this problem?
I want them all to offset in one direction!
Thank you!

Hello @tiga2013

Yes, you can do it, filter the line which you want and which you don’t want as per direction,
then delete the lines which you don’t want.

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Haha, then I need to do and operate it twice, but it’s also a good way to solve the problem

Basic logic can solve many problems. Thank you for your reply!:slight_smile: