Format - Block - Alternate Block

Ribbon bar. Select the Format tab. In the Block group, click Formats and from the menu, select Alternate Block...

Classic menus. From the Format - Block submenu, select Alternate Block...

...to apply the Alternate Block format to the selected cell(s). This format is a default format that is always available on this menu. To edit this format, use the options in the Format Manager.

See also: Format Overview.