When you edit or modify code, line numbers make code easier to scroll and parse. Word wrap helps you avoid horizontally scrolling long lines of code (especially when you work in the authoring environment, or at low screen resolutions).
Enable or disable line numbers
(at
the upper-right corner of the Actions panel), select Line Numbers.
Highlight a specific line
(at
the upper-right corner of the Actions panel), select Go To Line.
Enable or disable line word wrap