Its exact location can vary depending on how Excel was installed on your machine, as well as the version you are using. If you are unsure of where the XLStart folder is located (step 7), use Windows to search for the folder. Now, any time you create a new workbook, Excel uses your template (Book.xlt) as its model for what you want. (Do not save it in the default template folder.) Save your newly created template in the XLStart folder.The file name you use should be Book.xlt.In the Save As Type pull-down list at the bottom of the dialog box, select Template.(You can also just press F12.) Excel displays the Save As dialog box. This may include (but not be limited to) headers, footers, and the like. Make any other desired 'default' changes in the workbook.Make sure they reflect the page margins you want used as your default. Change the page margins for all the worksheets in the workbook.If you want to change the default page margins, you can do so by following these steps: One of those defaults is the page margins, used when you print the worksheet. When you first start Excel, the blank workbook that is opened has specific default values set.