LineIndentMaxFraction

is an option for Cell, StyleBox, and Style that specifies the maximum fraction of the total page width to indent at the beginnings of lines.

Details

The typical default setting is LineIndentMaxFraction->0.5.
The setting for LineIndentMaxFraction is relevant in formatting deeply nested expressions.

By default, linewrapped text is indented:

Wolfram Language code: Pane[Text["This is a line of wrapped text"], 100]

Specify the indentation as a fraction of page width:

Wolfram Language code: Pane[Style[Text["This is a line of wrapped text"], LineIndentMaxFraction -> 0.1], 100]

Specify no indentation:

Wolfram Language code: Pane[Style[Text["This is a line of wrapped text"], LineIndentMaxFraction -> 0], 100]

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