How do I change the header in Outlook 2016?

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Tags

1. #clicking
2. #located
3. #subject
4. #message
5. #start
6. #editing
7. #reading
8. #where
9. #click
10. #email
11. #fully
12. #right
13. #typing
14. #bottom
15. #window
16. #section
17. #corner
18. #expand
19. #caret
20. #header