Changing display of Name on Home Screen to Preferred Name

Summary:

I was able to figure out how to change a name to the Preferred Name in an Org Chart, however, I am unable to figure out how to change the first name to the Preferred Name on the Home Screen. Attaching 2 screenshots. 'Lou' preferred name, is now showing in the Org Chart for myself, however, 'Louis' is still showing when I log into Oracle on the Home screen. How do I change 'Louis' to 'Lou' on the Home Screen.

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