Incase you want to change the default font that excel uses, following the given steps to change it -
1. Click on Tools-> Options
2. Click on the General tab.
3. Select a font from the "Standard font" drop down list.
4. Select a different size if required.
5. Click OK.
The new setting will not take effect until excel is restarted. Once you restart, every new workbook and worksheet will use the new font and size.
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