As usual, put this in your Display Settings.

/* composing a new node: */
input[type="text"][name="node"],
/* editing a note you wrote: */
input[type="text"][name="note_title"],
/* wikis, faqlets, doclets, doclists, docstrings: */
input[type="text"][name="update_title"],
/* other specific node types: */
input[type="text"][name="categorized question_title"], 
input[type="text"][name="categorized answer_title"], 
input[type="text"][name="perltutorial_title"], 
input[type="text"][name="CUFP_title"], 
input[type="text"][name="monkdiscuss_title"], 
input[type="text"][name="perlmeditation_title"], 
input[type="text"][name="pmdevtopic_title"], 
input[type="text"][name="snippet_title"],
input[type="text"][name="perlnews_title"],
input[type="text"][name="perlquestion_title"],
input[type="text"][name="poem_title"],
input[type="text"][name="sourcecode_title"]
   { width: 60em; }
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