The default number of sheets for a new workbook is set to 1 in Excel 2016, Excel 2013 and Excel 2010. But Users are allowed to change the default sheet number using the Excel options.
Step 1: Launch Microsoft Excel 2013 and open a workbook.
Step 2: Click File menu and select options from the menu list.
Step 3: In the Excel Options, click the General settings and navigate to When creating new workbooks section.
Step 4: Now using the Include this many sheets option you can increase or decrease the number of sheets included while creating a new workbook.
Step 5: Click Ok button to confirm and save the changes.