By default in the Notebook interface the text wraps.
Is it possible to prevent this wrapping?
You can also set option
PageWidth -> Infinity for the Cell or Notebook, e.g.:
SetOptions[EvaluationNotebook, PageWidth -> Infinity]
There's also a way to do it programmatically with
SetOptions[$FrontEnd, LineBreakWithin -> False]
Recover the original with:
SetOptions[$FrontEnd, LineBreakWithin -> Automatic]
This function has not been fully integrated into the long-term Mathematica system, and is subject to change.