Vertical Line in center of screen

When you’re writing the spec or body of a package, there’s a vertical line in the middle of the screen in sql navigator. What is the purpose of this line? I thought maybe you were supposed to keep your code to the left of it but I can’t figure out what it’s for though for sure.

Thanks

This a mark to remember you to add line break to your code for better readability.
You can enter the position in
preferences - code editor - general - show right margin - right margin with.
Standard is 80 - this comes from old terminal screens which have 80 columns and 25 lines.