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Ok, this has bugged me for a while so I'm finally digging for suggestions.  I guess I'm searching for the wrong terms or whatever because I'm not finding what I need.  

From what I can find, Studio doesn't have any sort of “reference line” or other ways to have reference points aside from drawing a line but having the output off.  Ok, I can live with that.  However, for the life of me, I never get a line that doesn't have some sort of angle on it.  For instance, if I want a horizontal line, I try to draw one but it inherently ends up with some angle on it.  If I then try to set the height of that line to 0 which should make it perfectly horizontal, the software resets it to 1mm or something.  I just want to have some lines that I can use at times for reference or maybe just to cut off material without an angle.

I'm sure it's something simple and I appreciate any input pointing me in the right direction.