To enable the ReusableDocumentFormTabsPlugin, add the following (or something similar) to one of your Studio plugins:

        
...
<local:configuration>
  ...
  <editor:ReusableDocumentFormTabsPlugin
              defaultLimit="2"
              limitsPerContentType="{{'CMArticle': 3}}"/>
  ...
</local:configuration>
...

      

For each content type, a reusability limit can be configured that limits the amount of actual WorkArea Premulars for content items of this type. A limit of 0 effectively disables reusability for content items of the corresponding type. You can configure a default limit via the attribute defaultLimit or individually for each content type via the attribute limitsPerContentType.

The property limitsPerContentType overrides the property defaultLimit. So you can easily implement a white list for reusability (defaultLimit set to 0, limitsPerContentType set for some content types) as well as a black list (defaultLimit set to some value, limitsPerContentType set to 0 for some values)