You can use the settings in
Tools > Options > Text Editor > IMS and on the
Margins page to display the margins and the ruler.
Line Numbering
Specify your line numbering options for the right-hand side margin (column 73-80).
- Standard (right-hand side margin) increment (1 - 1000)
- Specify an increment for the standard line numbers. Numbers run down the right-hand side of the source. This is used by the
Renumber command.