Disable sharing proof via public URL or embed code
You can turn off the ability to share a proof with a public URL or embed code on a proof by proof basis or for individual users.
Disable per Proof
You must be the proof owner or creator, or you must have the Author or Moderator proof role.
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                  In the project that contains the proof, click Documents in the left panel. 
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                  Hover over the proof and select Document Details . 
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                  In the left panel, click Proofing Viewer Settings, then disable the Allow sharing proof via public URL or embed code checkbox.   
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                  Click Save. 
Disable per user
You can disable the Public proof setting for individual users in your Workfront instance. You must have a Proof Permission Profile of administrator to make this change.
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                  Click the Main Menu icon   
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                  Click Account Settings near the top-right corner. 
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                  Click the Users tab, then click on the name of a user. 
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                  In the Default proof settings section, disable the Public Sharing checkbox. 