create a new book follow these steps:
the menu File and
choose the option New
Or click on the button New
of the toolbar.
you use the button New, a new book will appear
automatically, but if you use the menu the getting started pane will be
opened on the right side of the window, it will look like this:
on the link
begin an empty workbook. (One could use another option in the bar but in that case
the workbook would be created from the other workbooks already created).
new workbook will be automatically open.