How do I customize Excel?

When the Excel Options window appears, click on the Customize Ribbon option on the left. Click on the Developer checkbox under the list of Main Tabs on the right. Then click on the OK button. Now you should see the DEVELOPER tab in the toolbar at the top of the screen.
For More Information Please Refer:
https://www.techonthenet.com/excel/questions/developer_tab2013.php
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