Ok,
I found it for the lines but my whole projet is drawn with object because this is the way to draw qith Lexocad.
I just think we could have the possibilty to set thickness of all objects just when we print?
Is there a possibility of improvement?
Anyway, I've drawn all my project of house with it and I'm happy for that, I think the program is good, with some improvement and more stability (because sometime there are crashes!!), it should be a great program.
Thanx