SSMS (2012) limit # of characters on editor window line
SSMS isn't as full-featured as some other editors out there when it comes to visual formatting. I think the closest you'll get is using word wrap from Tools -&gt; Options  and then manually sizing your SSMS window to  force it to a smaller column width.



The bottom row of SSMS will tell you what column number your cursor is on, which may be helpful to size your window to approximately 100 columns wide.