Documentation
Publicon
Reference
Preferences
Formatting Options
...Linebreaking Options
IndentMaxFraction
• IndentMaxFraction is an option for cells that determines the maximum amount of indentation that can be automatically added to a line.
• IndentMaxFraction is specified as a fraction of the window width. If the automatic indentation added to a line would exceed IndentMaxFraction, then the line is not indented. The default setting is IndentMaxFraction 
0.5.
