If you would like to export a complete list of all custom content titles, you may do so by clicking on the format link you would like to export them as. These buttons are located on the top right of the titles tab.
Once logged into the admin portal, go to My Content --> Custom Content
This export will contain a complete list of titles
Depending on the number of titles in your account, there might be a slight delay before the download is available.
Once ready, your browser should either prompt, or automatically download your file.
You can export the file as a XLSV, CSV, copy the list, or print it.