Whenever a new spreadsheet is created, certain defaults are applied. For example, the font might be 9pt Arial and the background color white. Although you can always change these for individual spreadsheets, it's useful to be able to set them for all new spreadsheets as well.
Select the Options command from the Tools menu. The "Options" dialog box is displayed. In most cases, each tab of this dialog works in a similar way to the equivalent command from the Format menu - but as well as changing the current spreadsheet, the global defaults for all new spreadsheets are set.
You can read about the available options and how to set them in the following sections.
General - spreadsheet size, units of measurement, trailing/leading formats (see General options)
Font - fonts and styles (see Using the menus to select cell font and style)
Color (see Selecting the background color)
Header & Footer (see Adding a header and footer)
Page Margins (see Page setup)
Spelling & Thesaurus (see Spell checker and thesaurus)
Custom Lists (see Custom lists)
Options to control default view (see View options)