The default font and font size while creating a new workbook can be modified using the Excel 2007/2010/2013 options. Listed below are steps to change the default font settings in Excel.
Step 1: Open a workbook in Excel 2013.
Step 2: Click the File menu and select Options from the menu list.
Step 3: In the Excel options, click the General options if it is not already selected.
Step 4: Navigate to When creating new workbooks section and using the “Use this as the default font” and “Font size” drop downs you can change the default font and font size respectively.
Step 5: After making the necessary Font settings changes, click OK button to confirm and save the changes.
Now whenever a new workbook is opened, the font settings changes will be reflected.