Final answer:
To change the theme of an Excel 2016 workbook, go to the 'Page Layout' tab and select a theme from the available options.
Step-by-step explanation:
To change the theme of an Excel 2016 workbook, you need to use the 'Page Layout' tab.
- Open your Excel workbook.
- Click on the 'Page Layout' tab located at the top of the Excel window.
- In the 'Themes' group, you can choose from the available themes by clicking on them. The selected theme will immediately be applied to your workbook, changing the colors, fonts, and overall visual appearance.