Final answer:
The Page Layout tab in Microsoft Excel allows you to see and edit how your worksheet will appear when printed, providing features like margin adjustments and print area settings.
Step-by-step explanation:
The tab that lets you see exactly how your worksheet looks before printing in Microsoft Excel is the Page Layout tab. When you click on Page Layout, you have access to various features that help you control the layout of the worksheet on a printed page. This includes adjusting margins, orientation, size, print area, breaks, background, and more. To specifically see how the sheet will look when printed, you can use the 'Print Preview' feature, which is accessible from the Print command under the File menu, but Page Layout offers a live preview as you make changes.