By default in the Notebook interface the text wraps.
Is it possible to prevent this wrapping?
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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.