From Xojo Documentation
| This item was deprecated in version 2019r2.
Please use StyledText.ParagraphTextAlignment as a replacement.
| This method is only available on macOS and Windows platforms.
For cross-platform compatibility, use ＃If...＃Endif with the Target... specifiers to make sure you will not attempt to use this method on an incompatible platform.
Aligns the paragraph indicated by Index. Index is zero-based.
Not supported with Linux TextFields.