The Duplicate Content Defender ("DCD") helps prevent duplicated pages from being created.
See the documentation for your Release
Configure the Duplicate Content Defender
In the Confluence administration you can configure the Plugin under Duplicate Content Defender → Configuration.
There are two behavioral controls in the plugin:
You can regulate if the plugin works in every space or just in the dedicated spaces you choose. (default: All spaces)
You can regulate if the plugin searches possible duplications in all spaces where it is active or only in the current space. (default: All spaces) If you decide to allow the search only in the current space the user will have no option ("search only in current space") to modify the search (see User Guide).