This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)
Mathematica Menu Item

Window Show Ruler

Show Ruler
toggles ruler display along the top of a notebook.
  • Use the ruler to set the text margins of selected cells and set the indentation of cell names and keywords.
  • This command sets the option WindowToolbars->{"RulerBar"} on the selected notebook.