How do you center a worksheet both horizontally and vertically?

To center a worksheet both horizontally and vertically in Excel, go to the "Page Layout" tab and click on the "Page Setup" dialog launcher (the small arrow in the bottom right corner). In the "Page" tab of the dialog, check the boxes for "Horizontally" and "Vertically" under the "Center on page" section. Click "OK" to apply the settings. This will ensure that your printed worksheet is centered on the page.