Changing the visibility of your organization membership
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In the top right corner of GitHub Enterprise Server, click your profile photo, then click Your organizations.  
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Click the name of your organization. 
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Under your organization name, click People.  
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Locate your username in the list of members. If the list is large, you can search for your username in the search box. 
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Next to your username, select the visibility dropdown menu, then click a new visibility. - To publicize your membership, choose Public.
- To hide your membership, choose Private.
 