When you have finished with a particular workbook and want to continue working in Excel, you can easily close the current workbook. Click the Close ( X ) button in the upper-right corner of the workbook. (There are two Close buttons ; the one on top closes Excel, and the one below it closes the current workbook window.) You can also close the current workbook by selecting File , Close . If you have changed the workbook since the last time you saved it, you will be prompted to save any changes.