UnityGame/Library/PackageCache/com.unity.ugui/Documentation~/TextMeshPro/RichTextLineIndentation.md

Line Indentation

The <line-indent> tag inserts horizontal space directly after it, and before the start of each new line. It only affects manual line breaks (including line breaks created with the <br> tag, not word-wrapped lines.

You can specify the indentation in pixels, font units, or percentages.

The </line-indent> closing tag ends the indentation of lines.

Example:

<line-indent=15%>This is the first line of this text example.
This is the second line of the same text.

Indent every new line, with one tag