• The ribbon is a group of toolbars at the top of Office programmes' windows that are designed to assist you discover the commands you need to finish a task quickly.
• Select the Ribbon Display Options icon Ribbon icon in the top-right corner.
• Choose one of the following options for the ribbon
• Show Tabs and Commands keeps all of the ribbon's tabs and commands visible at all times.
• Show tabs just reveals the ribbon tabs, allowing you to see more of your work while still being able to rapidly flip between them.
• The Auto-Hide ribbon hides the ribbon so you can see your document better, and only exposes it when you pick More or use the ALT key.
• If you need to see more of your document, double-click any of the ribbon tabs or press CTRL+F1 to collapse the ribbon.
• Simply double-click any ribbon tab or press CTRL+F1 to bring up the ribbon again.

Read More: How you can customize the indent amount in ms-word?