Word Wrap command (Document menu)
Use this command to turn on or off the word-wrap feature of current document. Word-wrap feature helps to edit long lines more conveniently.This setting will not be saved to the INI file. You can specify permanent value on Settings & Syntax page of the Preferences dialog box.
Shortcuts
Toolbar: 
Keys: Ctrl+Shift+W
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Keys: Ctrl+Shift+W