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I dont lnow it is correct my family of beam . When use a Ref Level view , appear a black line. I don´t know what means that.
Your view is set to coarse. Try changing it to Medium or Fine.
You asked the same question and had the answer.
https://forums.autodesk.com/t5/revit-architecture-forum/help-i-start-learn-revit/m-p/11785824#M38432...
Why don't you delete it and set Symbolic Representation to from Project Settings?
never-displayed
