/en/excel2013/excel-2013-customizing-the-ribbon/content/
If you're working on a touch-screen device, you can enable Touch Mode to create more open space on the Ribbon, making commands easier to tap with your fingers.
Adding Touch/Mouse Mode to the Quick Access toolbar
Selecting Touch Mode
The Ribbon in Touch ModeTo turn off Touch Mode, click the Touch/Mouse Mode command, then select Mouse from the drop-down menu.
Selecting Mouse Mode
/en/excel2013/what-are-reference-styles/content/