How can I hide an attribute on the person profile?
You must have the HR specialist role to hide an attribute on the person profile.
To hide an attribute on the person profile:
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            Click Manage Profile Types on the Tasks tab in the Profiles work area. 
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            Search for the Person profile type and select the row for the profile type in the Search Results section. 
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            Click Edit in the Search Results section to open the Edit Profile Type page. 
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            On the Content Sections tab, select the content section that includes the attribute you want to hide. 
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            In the Content Sections region, click the selected content section link to open the Content Section page. 
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            In the Content Properties section, select None as the Display value for the attribute you want to hide.