Click File and then on Options. In the File Options box, click General. Under When creating new workbooks, in the Font Size box, enter the font size you want. In the Use this as the default font box, click the font you want to use.
Click File and then on Options. In the File Options box, click General. Under When creating new workbooks, in the Font Size box, enter the font size you want. In the Use this as the default font box, click the font you want to use.